Last updated: June 2026
Your Raypak pool heater keeps the water comfortable through the season, so it puts in a lot of work. And like anything that runs that hard, it needs a little upkeep to stay at its best.
After heating thousands of gallons, parts start to wear. Heating takes longer than it used to. The unit cuts off at random. You’re not sure why, but you want it working again.
That’s what this guide is for. Whether you have a Raypak gas heater or a Raypak heat pump, these steps walk you through the most common problems and how to track them down. We’ve repaired more than 3,000 pool heaters, so these are the same checks our techs run first.
Want a shortcut? Call us for a free phone diagnosis at (407) 786-0000.
How to troubleshoot your Raypak pool heater
Start here: check your water flow
If you wake up and the heater won’t run, water flow is the first thing to check.
Without enough water, a Raypak heater shuts itself down to avoid overheating. This is often what people mean when they say the heater is “turning off and on.” (Related: pool heater won’t turn on.)
If your unit has a water flow light on the display, check whether it’s lit. No light? Walk to your filter pump and check the pressure.
Clean and check these for blockage:
- Your filter
- Your filter pump’s basket
- Your skimmer basket
- The multiport valve positions
Clear the blockage, restore flow, and many “won’t run” problems solve themselves.
How to reset your Raypak heater
Sometimes the fix is a simple reset. Two ways to do it:
- Breaker reset. Walk to the heater’s breaker, flip it fully off, wait a moment, then back on. Check the display
- Unit reset. Many Raypak models have a reset on the control panel after a lockout (for example, an ignition lockout on gas units). Press it once, then watch for the heater to restart
If the display stays blank or the heater locks out again right away, you’re likely dealing with an electrical fault or a tripped safety. Check the connection points for damage or corrosion, and if everything looks normal but the unit won’t respond, it’s time for a pro.
Have the right tools ready
Most of these checks don’t require opening the heater, but having the tools on hand makes the next steps faster:
- Multimeter that reads AC volts, DC volts, and Ohms
- 24″ manometer (fan-assisted units may need more than one)
- 5/16 nut driver
- Screwdriver
- Channel locks
- Needle-nose pliers
- Combustion analyzer (for commercial units)
Heater runs but won’t heat
Maybe the unit powers on fine but heats half as well, and takes twice as long. Before you assume the worst, run through these:
- Is it at least 60 degrees out? Heat pumps pull warmth from the air, so cold weather naturally cuts performance
- Are you running it 8+ hours a day? It takes that long to warm the bulk of your pool’s water
- Are you using a solar cover? A cover cuts heat loss by up to 75%, and it’s a quick way to test the heater. Cover the pool and watch. If the water holds heat well, the issue was loss to the air, not the heater. If it still struggles, the heater is the suspect
Still weak after all that? On a heat pump, the cause is often a dirty evaporator coil. That coil turns warm air into heat for your pool, and over time it builds up dirt and grease. An annual service cleans it.
Also check the metal vents in front of the coil for leaves or twigs, and clear anything blocking the airflow. The clearer the airway, the better.
Raypak error codes
Raypak heaters flash a fault code when something specific goes wrong, like low flow, a sensor fault, an ignition lockout, or a high limit trip. The code tells you where to look.
Codes vary by model, and Raypak uses different sets for the Crosswind and Crosswind V heat pumps, the Avia and Digital gas heaters, and older R-series units. Rather than list a partial set here, we keep the full, model-by-model breakdown in one place.
See the complete Raypak pool heater error codes guide for every code by model and what each one means.
Raypak gas heater won’t ignite
A quick note: Medallion Energy services electric, heat pump, and solar pool heaters, not gas units. The steps below are DIY guidance for Raypak gas heater owners.
If your gas Raypak lights the display but won’t fire, work through these:
- Gas supply. Confirm the gas valve and the main supply valve are both open
- Igniter and flame sensor. Dirt or corrosion on the igniter or flame sensor is a common ignition culprit. Inspect and clean carefully
- Lockout. After a few failed attempts, many Raypak gas units enter an ignition lockout. Reset it once (see “how to reset” above). If it locks out again, stop and call a pro
If your heater is showing a specific ignition or lockout code, match it in the Raypak error codes guide.
When to call a pro
Some Raypak problems are safe to handle yourself: cleaning the filter, restoring flow, resetting the breaker, clearing the vents. Others, like electrical faults, refrigerant issues, gas work, or a code that keeps coming back, need a trained tech.
You don’t have to guess which is which. Medallion Energy is EPA 608 certified and licensed (CPC056806), with more than 3,000 pool heater repairs behind us and a 98% satisfaction rate. Every job starts with a free phone diagnosis, so you get answers before you book a visit.
Looking for Raypak’s own technical support? They have a tech support line for their products. But if you’re in Central Florida and want hands-on help, we’re a call away.
Call (407) 786-0000 for a free phone diagnosis, or schedule a pool heater repair.
Frequently asked questions
How do I reset my Raypak pool heater?
Flip the heater’s breaker fully off, wait a moment, then back on, and check the display. If your model locked out (common on gas units after failed ignition), press the reset on the control panel once. If it locks out again right away, you have an underlying fault that needs diagnosis.
Why won’t my Raypak pool heater turn on?
The most common cause is low water flow from a dirty filter, a closed valve, or a clogged basket, which trips the heater’s safety shutdown. Restore flow first. If it still won’t start, check the breaker and the electrical connections.
Why is my Raypak heater running but not heating well?
Check the outside temperature (heat pumps lose output below about 60 degrees), confirm you’re running it at least 8 hours a day, and test with a solar cover. If it still underperforms, a dirty evaporator coil or blocked vents are the usual causes.
My Raypak keeps turning off and on. What’s wrong?
That’s almost always a water flow issue. The heater shuts down to protect itself when flow drops. Clean the filter and baskets, open all valves, and check the water flow light or filter pressure.
What does it mean when my Raypak shows an error code?
Each code points to a specific fault, like low flow, a sensor problem, or an ignition lockout. Look yours up in our Raypak pool heater error codes guide, which lists codes by model.
Why won’t my Raypak gas heater ignite?
Check that the gas valves are open, then inspect the igniter and flame sensor for dirt or corrosion. Repeated failures often trigger an ignition lockout. Reset it once, and if it returns, call a professional.
Should I troubleshoot my Raypak myself or call a pro?
The basics are safe to DIY: filter cleaning, restoring flow, resetting the breaker, clearing vents. Anything involving electrical testing, refrigerant, gas, or a recurring code should go to a professional. A free phone diagnosis can tell you which it is.
How much does Raypak pool heater repair cost?
Most pool heater repairs run $200 to $800 depending on the part. Simpler fixes like sensors or capacitors land at the lower end, while major component work runs higher. Service calls in Florida typically run $100 to $250, but Medallion starts with a free phone diagnosis, and you always get a written estimate first.