7 Useful Raypak Pool Heater Troubleshooting Tips | Medallion Energy (2024)


Your Raypak pool heater keeps your pool comfortable throughout the seasons. So naturally, it gets a lot of use during that time.

While pool heat pumps are built to provide countless hours of heat, theystill need maintenance to stay at peak performance.

After heating thousands of gallons of water, certain parts in your pool heater may begin wearing down. Which results in the heater running in unusual ways.

Heating up the water starts taking longer, and sometimes the pump shuts off at random.

You’re not sure of the cause, but you know that you want to get your pool heater working again. And that’s why these Raypak poolheater troubleshooting tips are perfect for you.

In this post, we go over a few things you can do to make troubleshooting your Raypak pool heat pump much easier.

Have the right tools for the job

7 Useful Raypak Pool Heater Troubleshooting Tips | Medallion Energy (1)

Although most of the troubleshooting tips in this post don’t require opening up the heater, having the tools for the job comes in handy later.

When you’re ready to troubleshoot your pool heater and get it fixed, you’ll want to be prepared. Having the right tools from the start helps you troubleshoot your pool heater faster.

Before calling for heat pump service, gather these tools:

  • Multimeter capable of checking AC volts, DC volts, and Ohms
  • 24”Manometer (for fan assisted units, more than one manometer will be needed).
  • 5/16 nut driver
  • Screwdriver
  • Channel Locks
  • Needle-Nose Pliers\
  • Combustion Analyzer needed for all commercial units.

If the unit doesn’t run, check the water flow lamp

If one day you wake up and your pool heat pump stops running, the first thing to check is your water flow.

Without an adequate source of water, a pool heat pump automatically shuts down to prevent overheating. This is sometimes the cause of what many describe as a pool heat pump turning off and on.

If your pool heater keeps turning off and on, check to see if the water flow light on the display is lit up. If your unit doesn’t have this light, then walk over to your filter pump and check the pressure.

A few areas to clean & check for blockage include:

  • Your filter
  • Your filter pump’s basket
  • Your skimmer basket
  • & the multiport valve positions

Related: Pool Heater Won’t Turn On

Run the pump for at least 8 hours to test heat loss

7 Useful Raypak Pool Heater Troubleshooting Tips | Medallion Energy (2)

Maybe your pump turns on just fine but doesn’t heat the way it used to. For some reason, it seems as if it’s only heating half as well, and taking twice as long.

Although poor heating ability can be a sign of a dirty evaporator coil (more on this later), there are a few things to consider when heat loss is an issue.

  • Is the temperature at least 60 degrees or more?
    • If it’s too cold out, the performance of your pool heat pump will naturally be affected due to a lack of ambient heat.
  • Are you running the heater at least 8 hours each day?
    • In order to warm the majority of your pool’s water, your heater needs at least 8 or more hours of run time
  • Are you using a solar cover?
    • A solar cover reduces heat loss by 75%. By using a cover, you can test whether or not your heater is the source of the problem

Check air flow to troubleshoot a lack of heat

If you’ve gone through all the previous steps for troubleshooting heat loss, the cause of the problem might be a dirty evaporator coil.

The evaporator coil is the part responsiblefor turning harvested warm air into usable heat for your pool. Each day, a bunch of air passes through the coil.

Over time, the coil begins builds up a layer of debris, dirt, and grease from processing so much air. An annual heat pump service takes care of this, cleaning the coil and any other related parts.

That said since your evaporator coil sits behind a layer of metal vents, the blockage could also be there.

If you see any leaves or twigs lodged in the vents, remove them. Any debris caught in the vents can impact air floor.

So the clearer the airway the better.

Reset the breaker to troubleshoot an unresponsive display board

7 Useful Raypak Pool Heater Troubleshooting Tips | Medallion Energy (3)

There might be a few cases when you can’t even get ANYTHING to show up on display board.

No “ON” lights, no water flow indicators. Nothing. Just a blank screen.

Fortunately, this doesn’t always mean that your pool heater is toast. Instead, what you’re dealing with is likely an electrical issue.

To troubleshoot this:

  • Walk over to your pool heater’s breaker and reset it
  • Go back and check the display. Is it on?
  • If not, check out electrical connection points for damage or corrosion.
    • If everything looks normal, but your heat pump is unresponsive, contact a pool heat pump technician for advanced troubleshooting steps.

Look out for Raypak heat pump error codes

Every now and then, your Raypak pool heat pump might display a code. These codes help you understand what problems your heater is having.

Here are a few common Raypak troubleshooting codes and what they mean. Use these to troubleshoot your Raypak pool heater:

  • LP & LP3
    • Low refrigerant if one “LP”
    • If “LP3”, likely a low-pressure issue
  • HP & HP6
    • Low water flow
    • Faulty high-pressure switch (shuts down to protect unit)
  • FLo& FL3
    • Pump is off or backwashing
    • Dirty pool filter
    • Low water
    • Faulty water pressure switch
  • FS
    • Defrosting cycle (a regular function)

Use a solar cover to pinpoint the source of heat loss

7 Useful Raypak Pool Heater Troubleshooting Tips | Medallion Energy (4)

    • Image via


As mentioned earlier, using a solar cover helps you pool hold on to heat more effectively. But it’s also a quick way to determine the source of heat loss.

By applying a solar cover, you can figure out whether it’s your pool or pool heater that’s creating the heat loss.

If it’s your pool, and likely the outdoor temperature, then applying a solar cover will make a noticeable difference.

But if the issue is your pool heater, then you’ll still experience significant heat loss with or without the cover.

Closing thoughts on these Raypak pool heater troubleshooting tips

Effective Raypak pool heater troubleshooting is all about knowing what to look for, and what the signs mean. Although all pool heat pumps need maintenance to maintain performance, a bit of troubleshooting can save you a lot of time.

When you know what’s causing a problem with your pool heater, then fixing it is way simpler. But when you can’t figure out the problem yourself, you can get pool heater troubleshooting help over the phone.

If you liked this post, you might also like:

  • 9 DIY Pool Heater Repair Tips
  • When To Service Your Pool Heat Pump
  • 7 Ways Heat Pump Swimming Pool Heaters Simplify Pool Heating

Related posts:

The Best Pool Safety Equipment Checklist For Safer Swims21 Pool Care Hacks That Make Pool Maintenance EasyHow To Winterize Your Above Ground Pool in 7 Simple Steps


7 Useful Raypak Pool Heater Troubleshooting Tips | Medallion Energy (2024)


Why won't my Raypak pool heater power on? ›

Check the Power: If your Raypak pool heater isn't working at all, the problem could be something as simple as a lack of power. Go make sure there aren't any tripped circuit breakers in the fuse box, then check that the unit's time clock is set to the “On” position.

Why is there no power to my pool heater? ›

Tripped circuit breaker: The most common reason for a pool heater not turning on is a tripped circuit breaker or blown fuse. Check your breaker box and reset any tripped breakers or replace any blown fuses. ✓ Low water flow: If there isn't enough water flowing through the heater, it won't turn on as a safety measure.

Why is my pool heater not getting hot enough? ›

Your heater may have inadequate water flow due to a dirty filter, closed valve, external bypass, reversed water connections, or pressure switch out of adjustment. It is also possible that your thermostat is out of calibration or needs to be replaced.

How can I heat my pool more energy efficiently? ›

You can reduce the cost of heating your swimming pool by installing a high-efficiency or solar heater, using a pool cover, managing the water temperature, and using a smaller pump less often.

Why is my pool heater not flowing? ›

If your heater is not getting a steady stream of water, it could be due to a clogged filter or dirty pump basket. Turn off your heater and pump before cleaning. Clean the filter, skimmer, and pump baskets. Remove all removable parts, take out debris, and rinse with a hose before reinstalling the piece.

What would cause pool heater to not ignite? ›

There are several reasons that a pool heater will not light. The most common cause is a fuel delivery issue. In addition, the gas pressure would have to be measured with a manometer to ensure it is within the operating pressures specified in the installation manual.

Why is my pool not getting power? ›

One of the biggest causes of electrical malfunction with a pump is a loose connection. There can also be a blow fuse in the power board of the motor, voltage fluctuations that prevent the pump from working right, or problems with the wiring.

What powers a pool heater? ›

Liquid refrigerant within the evaporator coil absorbs the heat from the outside air and becomes a gas. The warm gas in the coil then passes through the compressor. The compressor increases the heat, creating a very hot gas that then passes through the condenser.

How do you bypass a low pressure switch on a pool heater? ›

The easiest way to jump out a spa or pool heater pressure switch is to use a short wire with two alligator clips, or other metal clips on the ends. But you can also do it with just a wire if you have a steady hand to hold each end of the wire into the grooves of each brass screw.

How to diagnose a pool heater? ›

Clean the filter, turn the temperature switch on, and reset the timer. Make sure the system valves are turned towards the heater. It's also possible that the heater you have is too small for your pool. Consult your pool heater's user manual to see if the heater is an appropriate size.

How do I increase the flow to my pool heater? ›

A dirty pool filter wins for the most popular water flow issue on a heater service call. Luckily, it's also the easiest one to diagnose and fix. You can overcome this issue by having a pool heater service tech or pool specialist remove the filter and run the pump again without a filter in.

What is the best temperature for a pool heater? ›

Pool water temperatures typically range from 78ºF to 82ºF. The American Red Cross recommends a temperature of 78ºF for competitive swimming. This coincides with good fuel savings. However, this may be too cool for young children and the elderly, who may require a temperature of 80ºF or higher.

What is the black hose trick? ›

The Black Hose Trick

Grab your black garden hose, fill it up, and leave it in direct sunlight. This will warm the water within and heat your pool as you refill. However, this method has several problems, as a lack of sunlight will prevent your hose from warming up. Also, this method only works when refilling your pool.

How can I speed up my pool heating? ›

1. Go Solar
  1. Solar Pool Covers. Solar covers—also called solar blankets—form a barrier between the water and the sun, allowing the pool to absorb and retain heat (a pool can lose about 5 degrees per hour from evaporation). ...
  2. Liquid Solar Pool Covers. ...
  3. Solar Dome. ...
  4. Solar Rings. ...
  5. Solar. ...
  6. Gas or Propane. ...
  7. Heat Pump. ...
  8. Electric Resistance.
Mar 1, 2024

Why is my pool heat pump not turning on? ›

If the water is flowing too slowly, it simply won't turn on. Be sure that the water level in the pool is correct, the filter and baskets are clean, and the pump running fully primed, to provide enough water flow to keep the heater pressure switch and/or flow switch in the closed position.

Why does my pool pump have no power? ›

Check the circuit breaker for the circuit that powers the pump and reset it if necessary. If the power supply is working correctly, put your ear close to the pump while it is switched on. If it makes a humming noise but does not run, the capacitor could be faulty and in need of replacement.

Why does my pool heater shut off? ›

The most common cause of a heater that cycles on and off could be inadequate water flow to a dirty filter or closed valve. (See information on How to Backwash a DE Filter or Clean a Cartridge Filter).

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