Hayward Pool Heater Error Codes

What Every Code Means and When to Call a Pro

If your Hayward heater is showing a code, find it in the tables below. Learn what the code means, the likely cause, whether you can fix it yourself, and how urgent it is.

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3 Things to Try Before Calling a Technician

Power-cycle

Turn off the heater, then the circuit breaker. Wait 5 minutes (30 min for VS/inverter models). Restore power. Clears CE, sensor trips, and many pressure faults.

Check water flow

Most codes (FLo, E03, E06, LO, LP, HP) are caused by low flow, not a broken part. Confirm pump is on, filter is clean, all valves are open, bypass is closed.

Check outside temp

Most heat pumps won’t run below ~50–55°F. Codes like LP, TP, E19, E29, E05 in cold weather are normal, so just wait for warmer conditions.

Disclaimer: This page is for informational purposes only. Pool heaters involve gas, electricity, and high temperatures — internal repairs should always be performed by a qualified technician. If a fault code persists or involves gas or electrical components, contact a licensed professional. Improper service may void your warranty or cause injury.

Click the button for your pool heater, then scroll down to view error codes.

We cover all four Hayward pool heater lines: HeatPro (HP31005T, HP50HA2, MCHX), VS Series, H Series gas, and HC Dual Fuel.

Hayward HeatPro HP31005T & W3HP31005T Error Codes

All error codes for the Hayward HeatPro HP31005T and W3HP31005T heat pump pool heaters.

Sensor Fault Codes (P01–PP)

What it means & what to do: Sensor failures. Check wire connections first — if loose, reseat and restart. If code returns, sensor replacement required.

Code	What It Means	Likely Cause	DIY?	Urgency
P01	Inlet temp. sensor fault	Temp. sensor broken or short circuit	Sometimes	Medium
P02	Outlet temp. sensor fault	Temp. sensor broken or short circuit	Sometimes	Medium
P04	Ambient temp. sensor fault	Temp. sensor broken or short circuit	Sometimes	Medium
P05	Coil 1 temp. sensor fault	Temp. sensor broken or short circuit	No	Medium
P15	Coil 2 temp. sensor fault	Temp. sensor broken or short circuit	No	Medium
P07	Suction temp. sensor fault	Temp. sensor broken or short circuit	No	Medium
P081	Discharge temp. sensor fault	Temp. sensor broken or short circuit	No	Medium
P082	Exhaust air over-temp. protection	Compressor overloaded	No	High
P09	Antifreeze temp. sensor fault	Antifreeze temp. sensor broken or short circuit	Sometimes	Medium
PP	Pressure sensor fault	Pressure sensor is broken	No	High

Protection & Flow Fault Codes (E01–E051)

What it means & what to do: Flow, refrigerant, and antifreeze protection. Check water flow first for E03, E05–E07, E19, E29 before calling a technician.

Code	What It Means	Likely Cause	DIY?	Urgency
E01	High pressure protection	High pressure switch is broken	No	Stop
E02	Low pressure protection	Low pressure protection triggered	No	Stop
E03	Flow switch protection — no/little water	No or little water in water system	Yes	High
E05	Waterway antifreeze protection	Water temp. or ambient temp. too low	Yes	Low
E06	Inlet & outlet temp. too high	Water flow too low and low differential pressure	Yes	High
E07	Antifreeze protection	Water flow too low	Yes	Medium
E19	Primary antifreeze protection	Ambient temp. too low	Yes	Low
E29	Secondary antifreeze protection	Ambient temp. too low	Yes	Low
E051	Compressor overcurrent protection	Compressor overloaded	No	Stop

Communication, Temperature & Fan Fault Codes (E08, E081, TP, F51, F31, F32)

What it means & what to do: Communication, temperature, and fan fault codes. E08/E081 are wiring checks you can attempt yourself; TP and the antifreeze codes clear when temps rise; F51/F31/F32 are fan motor failures requiring a technician.

Code	What It Means	Likely Cause	DIY?	Urgency
E08	Communication fault — controller to main board	Communication failure between controller and main board	Sometimes	High
E081	Communication fault — speed control module to main board	Communication failure between speed control module and main board	Sometimes	High
TP	Low AT protection	Ambient temp. too low	Yes	Low
F51	EC fan feedback fault	Fan motor issue caused fan motor to stop running	No	High
F31	Fan motor 1 fault	a) Motor in locked rotor state b) Wire connection between DC fan motor module and fan motor in bad contact	No	High
F32	Fan motor 2 fault	a) Motor in locked rotor state b) Wire connection between DC fan motor module and fan motor in bad contact	No	High

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Hayward HeatPro HP50HA2 / HP70HA2 Error Codes

All error codes for the Hayward HP50HA2 and HP70HA2 heat pump pool heaters.

Hayward HP50HA2/HP70HA2 Pool Heater Error Codes

Code	What It Means	Likely Cause	DIY?	Urgency
P01	Inlet temp. sensor fault	Temp. sensor broken or short circuit	Sometimes	Medium
P02	Outlet temp. sensor fault	Temp. sensor broken or short circuit	Sometimes	Medium
P04	Ambient temp. sensor fault	Temp. sensor broken or short circuit	Sometimes	Medium
P05	Coil 1 temp. sensor fault	Temp. sensor broken or short circuit	No	Medium
P15	Coil 2 temp. sensor fault	Temp. sensor broken or short circuit	No	Medium
P07	Suction temp. sensor fault	Temp. sensor broken or short circuit	No	Medium
P081	Discharge temp. sensor fault	Temp. sensor broken or short circuit	No	Medium
P082	Exhaust air over-temp. protection	Compressor overloaded	No	High
P09	Antifreeze temp. sensor fault	Antifreeze temp. sensor broken or short circuit	Sometimes	Medium
PP	Pressure sensor fault	Pressure sensor is broken	No	High
E01	High pressure protection	High pressure switch is broken	No	Stop
E02	Low pressure protection	Low pressure protection triggered	No	Stop
E03	Flow switch protection	No or little water in water system	Yes	High
E05	Waterway antifreeze protection	Water temp. or ambient temp. too low	Yes	Low
E06	Inlet & outlet temp. too high	Water flow too low and low differential pressure	Yes	High
E07	Antifreeze protection	Water flow too low	Yes	Medium
E19	Primary antifreeze protection	Ambient temp. too low	Yes	Low
E29	Secondary antifreeze protection	Ambient temp. too low	Yes	Low
E051	Compressor overcurrent protection	Compressor overloaded	No	Stop
E08	Communication fault — controller to main board	Communication failure between controller and main board	Sometimes	High
E081	Communication fault — speed control module	Communication failure between speed control module and main board	Sometimes	High
TP	Low AT protection	Ambient temp. too low	Yes	Low
F51	EC fan feedback fault	Fan motor issue caused fan motor to stop running	No	High
F31	Fan motor 1 fault	1) Motor in locked rotor state 2) Bad wire connection between DC fan motor module and fan motor	No	High
F32	Fan motor 2 fault	1) Motor in locked rotor state 2) Bad wire connection between DC fan motor module and fan motor	No	High

Frequency Conversion Board Fault Codes

Code	What It Means	Likely Cause	DIY?	Urgency
F01	DRV1 MOP alarm	MOP drive alarm — recovery after 150s	No	High
F02	Inverter offline	Communication failure between conversion board and main board	Sometimes	High
F03	IPM protection	IPM modular protection — recovery after 150s	No	High
F04	Compressor driver failure	Lack of phase, step or drive hardware damage — check voltage and frequency conversion board hardware	No	Stop
F05	DC fan fault	Motor current feedback open or short circuit — check current return wires	No	High
F06	IPM overcurrent	IPM input current too high — check and adjust the current	No	High
F07	Inverter DC overvoltage	DC bus voltage too high — check input voltage	No	High
F08	Inverter DC undervoltage	DC bus voltage too low — check input voltage	No	High
F09	Inverter input undervoltage	Input voltage too low or input current too high — check input voltage	Sometimes	High
F010	Inverter input overvoltage	Input voltage too high (greater than outage protection current RMS) — check input voltage	No	High
F011	Inverter sampling voltage fault	Input voltage sampling fault — check and adjust the current	No	High
F012	Communication error DSP-PFC	DSP and PFC connection fault — check communication connection	No	High
F26	Input overcurrent	Equipment load is too large — check if unit is overloaded	No	Stop
F27	PFC fault	PFC circuit protection — check if PFC switch tube is short circuited	No	Stop
F15	IPM overheating	IPM module overheat — check and adjust the current	No	High
F16	Weak magnetic warning	Compressor magnetic force too low — restart after multiple power failures; if fault continues, replace compressor	No	High
F17	Inverter input out of phase	Input voltage lost phase — check and adjust the voltage	No	Stop
F18	IPM sampling current fault	IPM sampling electricity fault — check and adjust the current	No	High
F19	Inverter temp. probe failure	Sensor short circuit or open circuit — inspect and replace sensor	No	Medium
F20	Inverter overheating	Transducer overheat — check and adjust the current	No	High
F22	Inverter overheating warning	Transducer temperature too high — check and adjust the current	No	High
F23	Compressor overcurrent warning	Compressor current too high — check and adjust the current	No	High
F24	Input overcurrent warning	Input current too high — check and adjust the current	No	High
F25	EEPROM overcurrent warning — MCU error	Check if chip is damaged and replace if necessary	No	Medium
F28	V15V over/undervoltage fault	V15V is overloaded or undervoltage — check V15V input voltage (range: 13.5V to 16.5V)	No	High

Hayward HP50HA2 / HP70HA2 Troubleshooting Lookup Chart

Problem	Possible Cause	Possible Solution(s)
Unit is not operating	a) No power to unit b) Breaker tripped c) Thermostat too low d) 3-minute compressor delay still running e) Low water flow f) Outside temp too low g) Fan not functioning	a) Make sure power is on b) Check breaker c) Turn thermostat up d) Wait for delay e1) Clean filter e2) Turn on pump e3) Unhook cleaning devices f) Check ambient temp g) Call for service
Heat pump running but display LEDs not on	System component failure	Call for service
Heat pump runs continually	a) Thermostat set too high for ambient b) Evaporator is dirty c) Electrical component failure	a) Turn thermostat down b) Clean by running tap water over coil (no pressure — will void warranty) c) Turn off pump; if unit still runs after 3 min, cut power and call for service
Heat pump cycling (on/off too quickly)	a) Bad bypass valve or improper water flow b) Low refrigerant, low ambient temp, or high humidity with low ambient temp	a) Ensure water flow is sufficient (filter pump running continuously?) — turn unit off if cycling continues b1) Check evaporator coil for severe frost b2) Call for service
Water coming from bottom of unit	a) Condensation b) Possible water leak	a) Normal — no concern b) Turn unit off for several hours (keep filter pump running); if water decreases it's condensation, otherwise possible leak

Frequency conversion faults are complex. The longer they run, the more damage they can cause.

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Hayward HeatPro VS Series Error Codes

All error codes for the Hayward HeatPro VS Series heat pump pool heaters.

Models: HP50952T, HP51202T. Inverter-driven compressor — most faults require a certified technician.

Hayward HP50952T/HP51202T Pool Heater Error Codes

Code	What It Means	Likely Cause	DIY?	Urgency
F02	Inverter offline	Communication failure between inverter and control board — check communication cable connection	Sometimes	High
F04	Compressor start failure	Compressor power overload	No	Stop
F05	Fan fault	Motor feedback open circuit or short circuit	No	High
F051	Fan fault	Motor feedback open circuit or short circuit	No	High
F06	Inverter overcurrent fault	Inverter power high — restart unit	No	Stop
F26	Inverter overcurrent fault	Inverter power high — restart unit	No	Stop
F10	Inverter under voltage fault	Unit supply voltage too low — confirm ample power supply	Sometimes	High
F19	Inverter over temperature	Inverter temperature out of range or near limits — restart unit	No	High
F20	Inverter over temperature	Inverter temperature out of range or near limits — restart unit	No	High
F22	Inverter over temperature	Inverter temperature out of range or near limits — restart unit	No	High
F25	Inverter EEPROM warning	Inverter check-sum communication error — restart unit	No	Medium

Inverter faults on the VS Series almost always need a certified tech. Catching them early prevents compressor damage.

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Hayward HeatPro MCHX Series Error Codes

All error codes for the Hayward HeatPro MCHX Series heat pump pool heaters.

Models: HP21105T, HP31105T, HCB1105T, W3HP21105T, HP21205T, HP31205T, HCB1205T, HP21405T, HP31405T, HCB1405T, W3HP21405T.

Hayward HeatPro MCHX Pool Heater Error Codes (Display Code Index)

Code	What It Means	Likely Cause	DIY?	Urgency
(blank)	No power to heat pump	a) Tripped circuit breaker / no power supply b) Faulty electrical component	Sometimes	High
(blank)	Unit will not turn on	a) Master power switch off b) Unit on 5-minute delay	Yes	Medium
FLo	Water pressure/flow switch circuit open	Low or no water flow — check pool pump, clean filter, open all valves, close bypass	Yes	High
LP	Low pressure switch circuit open	a) Air flow obstruction b) Low ambient temp. cutoff c) Unit low on refrigerant	Sometimes	High
HP	High pressure switch circuit open	a) Low water flow b) High water temp.	Yes	High
SO	Water temperature sensor open	Sensor not connected to control board	No	Medium
SS	Water temperature sensor short circuit	Sensor or sensor wires shorted	No	Medium
FS	Defrost mode	Frost buildup on evaporator coil — unit defrosting automatically	N/A	Low
dSO	Coil temperature sensor open	Sensor not connected to control board	No	Medium
dSS	Coil sensor short circuit	Sensor or sensor wires shorted	No	Medium

Troubleshooting Lookup Chart

Issues that may not display a code but indicate a problem.

Problem	Possible Cause	Possible Solution(s)
Unit is not operating	a) No power to unit b) Breaker tripped c) Thermostat not high enough d) 5-minute delay still running e) Low water flow f) Outside temp too low g) Fan not functioning	a) Make sure power is on b) Check breaker c) Turn thermostat up d) Wait 5 minutes e1) Clean filter e2) Turn on pump e3) Unhook cleaning devices f) Check ambient temp g) Call for service
Heat pump running but not heating; 'Run' light does not come on	a) Check output vs. input air temp differential — should be at least 8°F b) System component failure	a) Allow outside air temp to exceed 50°F then re-check b) Call for service
Heat pump runs continuously	a) Thermostat set too high b) Evaporator is dirty c) Electrical component failure	a) Turn thermostat down b) Clean by running tap water over coil (no pressure) c) Turn off pump; if unit still runs after 2 min, cut power and call for service
Heat pump cycling on/off too quickly	a) Bad valve or improper water flow b) Low refrigerant, low ambient temp, or high humidity	a) Check valve settings and water flow — turn unit off to prevent compressor damage if cycling continues b1) Check evaporator coil for severe frost b2) Call for service
Water coming from bottom of unit	a) Condensation b) Possible water leak	a) Normal — no concern b) Turn unit off for several hours (keep filter pump running); if water decreases it's condensation, otherwise possible leak

HeatPro MCHX codes can have multiple causes. A quick diagnosis tells you exactly what’s wrong before it becomes a bigger repair.

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Hayward H Series Pool Heater Error Codes

All error codes for the Hayward H Series gas pool heaters.

Models: H150FD, H200FD, H250FD, H300FD, H350FD, H400FD. Codes appear on the digital display panel.

Hayward H Series Pool Heater Error Codes (Display Code Index)

Code	What It Means	Likely Cause	DIY?	Urgency
AC	Air switch circuit closed error	Blower vacuum switch closed when expected open. If closed before blower starts, ignition board will not start blower until circuit is opened.	No	Medium
AO	Air switch circuit open error	Blower vacuum switch open when expected closed. Board will shut off gas and air flow and attempt new ignition. If switch doesn't close after blower starts, board suspends ignition and goes into lockout (blower continues running).	No	High
bd	Ignition control board data error	Board does not satisfy self-diagnostic or input data corrupted on power-up or initial trial for ignition — lockout until corrected	No	High
bd	Gas valve sensed as 'ON' error	Gas valve powered when it should be off — heater shuts down and goes into lockout; blower operates until corrected	No	Stop
bd	Gas valve sensed as 'OFF' error	Gas valve unpowered but flame sensed — blower runs 5s then new ignition sequence; if occurs 10x during call for heat, goes into lockout	No	Stop
bo	Bypass operation mode	Normal display when controlled by remote thermostat. No service required. If not using remote thermostat, press and hold DOWN + MODE keys for 3 seconds to remove.	N/A	Low
CE	Communication error	Communication between ignition board and display board not established within 3s of power-up, or lost for 30s during operation — unit shuts down. Clears on valid data exchange.	Sometimes	High
EE	EEPROM error	Error detected in ignition control board	No	High
HF	High flame sensor signal error	Flame sensed with gas valve off — goes into lockout; blower runs until corrected; auto-restart after 2 min	No	Stop
HS	High temperature sensing error	A) Inlet sensor reporting temp in excess of 104°F — resumes 2 min after temp drops to 104°F or below. B) Inlet sensor reporting temp change faster than 6°F in 60 seconds (low water flow condition) — if detected 3x in one hour, heater goes into lockout	Yes	High
IF	Ignition failure error	Maximum number of ignition retries exceeded — heater shuts down and goes into lockout. Automatic reset after 60 minutes.	Sometimes	High
IO	Igniter open error	Igniter circuit open when blower is running — board turns off blower and goes into lockout. Auto-restart 2 min after corrected.	No	High
LO	Limit string open error	Limit string opened — heater shuts down and goes into lockout. Auto-restart 2 min after error condition corrected and limit string closes.	Sometimes	High
PF	Electrical power supply wiring error	Supply power polarity reversed, low voltage detected, or ground path insufficient. Resets immediately after error corrected.	Sometimes	High
Sb	Keypad stuck button error	Keypad button closed/pressed for more than 30s — unit shuts down. Clears when condition corrected.	Yes	Medium
SF	Temperature sensor failure error	Excessive temp difference between redundant thermistors (5°F or more) OR sensor 'out of bounds' (less than 10°F or greater than 180°F) — unit shuts down. Auto-restart 2 min after corrected.	No	Medium

Gas heater fault codes shouldn’t be ignored. We diagnose and repair Hayward H Series and HC Series heaters (all major brands welcome).

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Hayward Universal HC Series Pool Heater Error Codes

All error codes for the Hayward HDF275 and HDF400 gas pool heaters.

Hayward HDF275/HDF400 Pool Heater Error Codes

What it means & what to do: Sensor failures. Check wire connections first — if loose, reseat and restart. If code returns, sensor replacement required.

Code	What It Means	Likely Cause	DIY?	Urgency
AC	Air switch circuit closed error	Differential Pressure Switch closed when expected open. If closed before blower starts, board will not start blower until circuit opens.	No	Medium
A1	Air switch open before ignitor warm-up	Switch circuit never closed when blower turned on, or re-opened within 10 seconds of blower starting	No	High
A2	Air switch open after ignitor warm-up	Switch opened during the heating cycle	No	High
A3	Air switch open during post-purge	Switch opened after heating cycle completed but before 30-second post-purge could complete	No	Medium
b1	Ignition control board data error	Board does not satisfy self-diagnostic on power-up or initial trial for ignition — lockout until corrected	No	High
b2	Gas valve sensed as 'ON' error	Gas valve powered when it should be off — heater shuts down and goes into lockout; blower operates until corrected	No	Stop
b3	Gas valve sensed as 'OFF' error	Gas valve not powered but flame sensed — blower runs 5s then new ignition sequence; if occurs 10x during call for heat, goes into lockout	No	Stop
b4	Data retrieval error	Input data values corrupted on power-up or initial trial for ignition — lockout until corrected	No	High
bo	Bypass operation mode	Normal display when controlled by remote thermostat. No service required. Change setting per ELECTRICAL CONNECTIONS section of manual if not using remote thermostat.	N/A	Low
CE	Communication error	Communication between ignition board and display board not established within 3s, or lost for 30s during operation — unit shuts down. Clears on valid data exchange.	Sometimes	High
EE	EEPROM error	Error detected in ignition control board	No	High
HF	High flame sensor signal error	Flame sensed with gas valve off — goes into lockout; blower runs until corrected; auto-restart after 2 min	No	Stop
HS	High temperature sensing error	A) Inlet sensor reporting temp in excess of 104°F — resumes 2 min after temp drops below 104°F. B) Inlet sensor reporting temp change faster than 6°F in 60 seconds while heater is firing — if detected 3x in one hour, heater locks out	Yes	High
IF	Ignition failure error	Maximum number of ignition retries exceeded — heater shuts down and goes into lockout. Automatic reset after 60 minutes.	Sometimes	High
IO	Igniter open error	Igniter circuit open when blower is running — lockout. Auto-restart 2 min after corrected.	No	High
LO	Limit string open error	Limit string opened — lockout. Auto-restart 2 min after error condition corrected and limit string closes.	Sometimes	High
PF	Electrical power supply wiring error	Supply power polarity reversed, low voltage detected, or ground path insufficient. Resets immediately after error corrected.	Sometimes	High
Sb	Keypad stuck button error	Keypad button closed/pressed for more than 30s — unit shuts down. Clears when condition corrected.	Yes	Medium
SF	Temperature sensor failure error	Excessive temp difference between redundant thermistors (5°F or more) OR sensor 'out of bounds' (less than 10°F or greater than 180°F) — unit shuts down. Auto-restart 2 min after corrected.	No	Medium

Gas heater showing a code that won’t clear? Our master gas technician diagnoses Hayward H Series and HC Series heaters fast.

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When an Error Code Means You Need a Professional

DIY first: FLo/E03 (pump & flow), LP with debris (clear air intake), TP/E05/E19/E29 (cold weather), FS/dEF (defrost, normal), bo (bypass mode, normal), Sb (stuck button), LO when pump is off.
Call soon: Sensor codes (P01-P09, SO, SS, SF), comm faults (CE, E08), fan faults (F31, F32, F51), inverter faults (F02, F10, F19-F22), EE.
Stop unit now: E01/E02 (refrigerant pressure), E051/F04 (compressor), F17/F27 (phase loss/PFC), HF/b2/b3 (gas valve faults on H/HC Series), recurring IF. Turn off before calling.
Cost: Most repairs $150-$650. Sensors and flow switches are lower; boards and compressors are higher.

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FAQs

What does the IF code mean on a Hayward pool heater?

IF = Ignition Failure. The heater tried to light and couldn’t. Check that your gas shutoff valve is open and gas supply pressure is adequate. Auto-resets after 60 minutes. If it keeps returning, call a technician — it typically means a failing igniter, gas valve, or flame sensor.

What does '1F' mean on a Hayward pool heater?

Almost certainly the IF (Ignition Failure) code — the letter ‘I’ looks like ‘1’ on many Hayward LED displays. See the IF entry above.

How do I fix Hayward error code LO?

LO = limit string open. Most common cause: pool pump is off or water flow is low. Turn on the pump, clean the filter, open all valves. Clears within 2 minutes once flow is restored. If LO persists with normal flow, you have a pressure switch or limit switch fault — call a technician.

How do I reset a Hayward pool heater?

H/HC Series: press MODE to cycle through STANDBY and back to POOL or SPA. Any model: turn off the heater switch, then the circuit breaker. Wait 5 minutes (30 minutes for VS/inverter models). Restore power. This clears CE, sensor trips, and most pressure faults.

What does the SF code mean on a Hayward pool heater?

SF = temperature sensor failure. The two inlet thermistors are reading 5°F+ apart, or one is out of range (below 10°F or above 180°F). Auto-restarts 2 minutes after the fault clears. Requires a technician to test and replace the faulty sensor.

What does H5 mean on a Hayward heater?

Not a standard Hayward code. Most likely HS (high temperature sensing error) — the ‘S’ can look like ‘5’ on some displays. If you can’t match your code to anything in the tables above, call 407-786-0000.

Can I fix a Hayward error code myself?

Yes for some — check the DIY column in each table. The safest DIY codes: FLo/E03 (pump & flow), LP with visible debris, cold-weather antifreeze codes, FS/dEF (defrost, just wait), Sb (stuck button), LO when the pump is off. Everything else — sensors, refrigerant, comm faults, gas-valve codes — call a pool heater tech.

How much does it cost to repair a Hayward pool heater in Florida?

Most repairs run $150-$650. Sensors and flow switches are lower; boards, refrigerant, and compressors are higher. Call 407-786-0000 or book a repair online for pricing.

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