Sunrunner Heat Pump Error Codes

Doing some Sunrunner heat pump troubleshooting?

These Sunrunner heat pump error code explanations will help you fix some of the most common Sunrunner pool heater problems:

Sunrunner Heat Pump Error Codes

Sunrunner heat pump error code FLO

(My Sunrunner heat pump says FLO)

FLO

What it means: sensors are detecting low water levels in the heat pump

How to fix it:

• Check that pool pump is receiving enough water
• Ensure that your pool pump is sending water to the heat pump
• If possible, turn up the pump speed up a notch
• Check for any clogs or backups causing poor water circulation (filter, baskets, pump)

Sunrunner heat pump error code OFF

OFF

What it means: a normal function that appears when the heater is off, or when temperature set point is lower than 45 degrees

How to fix it:

• Nothing to fix

Sunrunner heat pump error code CFI

CFI

What it means: a menu point for selecting either “Celsius” or “Fahrenheit” for the temperature display format

How to fix it:

• Choose a temperature display format

Sunrunner heat pump error code ULC | ELC

ULC | ELC

What it means: 

ULC: a menu point for setting up a user lock code (leads to ELC)

ELC: a menu point for entering a secret lock code

How to fix it:

• Use the “Up”,”Down”, and “Pool/Spa” buttons to make a selection or exit out of ULC mode

Sunruner heat pump error code CFO

CFO

What it means: a menu point for selecting either CALL or FLEX mode

How to fix it:

• Use the “Up”,”Down”, and “Pool/Spa” buttons to choose a mode or exit

Sunrunner heat pump error code FS

FS

What it means: unit is performing a normal defrost cycle (usually occurs during temperatures under 38 degrees Fahrenheit)

How to fix it:

• Try FLO error code troubleshooting steps
• Seek professional assistance to recalibrate your water pressure switch
• Hire a pool heat pump repair technician to resolve the issue

Sunrunner heat pump error code LOC

LOC

What it means: this indicates an issue that requires professional service

How to fix it:

• Contact a pool heating professional to inspect the heater and resolve the issue