You’re ready for a swim, but the second you touch the water, you know something’s wrong. Your pool is cold, even though the heater should be running.

Fixing a pool heater starts with finding the cause. Sometimes, the fix is simple, like changing a setting or cleaning a dirty filter. Problems with gas, wiring, or parts inside the heater usually need professional repair.

Here are some common problems, what you can check yourself, and when to call a pool repair pro.

Pool Heater Won’t Turn On

Start with the circuit breaker. If your heater plugs into an outlet, make sure the plug is secure and the outlet works.

Next, check the control panel. Make sure the heater is on and isn’t in standby mode. An error code may also point you toward the problem.

If the breaker keeps tripping or you see damaged wiring, call a professional.

Pool Heater Runs but the Water Stays Cold

First, check the thermostat. It needs to be set higher than the current water temperature for the heater to kick on.

Next, check the filter and skimmer baskets. Dirt and debris can limit water flow and keep some heaters from working properly.

Outdoor temperatures can also affect heat pumps. If the settings and water flow look right but the pool stays cold, the heater may need repair.

Pool Heater Is Freezing Up

Cold weather can cause ice to form on a pool heat pump. A little frost may be normal, but heavy ice can keep it from working properly.

Keep leaves and debris away from the unit so air can move around it. Don’t chip or scrape off ice because you could damage the coils.

If the heat pump keeps icing over or won’t defrost, have it checked by a professional.

Pool Heater Won’t Ignite

If a gas pool heater won’t ignite, check the control panel for an error code. Also check the water flow. A dirty filter or closed valve can sometimes keep a heater from starting.

Older heaters may have a pilot light. Check the manufacturer’s instructions before trying to relight it.

Leave problems with gas valves, igniters or other internal parts to a professional. If you smell gas, turn off the heater and contact your gas utility or a qualified professional.

Pool Heater Is Leaking Water

Water around your heater doesn’t always mean there’s a leak. It could be condensation.

If the water keeps coming back, the heater may have a loose connection, worn seal, or damaged internal part. A damaged heat exchanger can also cause a leak.

Don’t take the heater apart to find the source. Internal leaks should be checked by a professional.

Pool Heater Is Making Strange Noises

You probably know what your pool equipment normally sounds like. New banging, grinding, or whistling noises are worth checking.

  • Banging or rumbling: Buildup or poor water flow
  • Clicking without starting: An ignition problem
  • Grinding or screeching: A worn or damaged motor or pump part
  • Rattling or vibrating: A loose part or trapped debris
  • Whistling: A water flow or air problem

If the noise is loud or getting worse, turn off the heater and have it checked.

When Should You Call a Pool Heater Repair Professional?

Some problems are easy to check yourself. Others can involve gas, electricity, or parts inside the heater.

Call a pool repair professional if:

  • The circuit breaker keeps tripping.
  • You see damaged wiring.
  • The heater has a gas or ignition problem.
  • Water is leaking from inside the unit.
  • The heater keeps freezing or shutting off.
  • You hear loud grinding, banging, or screeching.
  • The pool still won’t warm up after you’ve checked the basics.

If you smell gas, turn the heater off and contact your gas utility or a qualified professional right away.

Get Help Fixing a Pool Heater in the Fort Worth Area

If you’ve checked the basics and your pool still won’t heat up, Lemaster Custom Pools can find the problem and recommend the right repair.

For help fixing a pool heater in the Fort Worth area, call 817-389-2688 for a free repair quote. We’ll help get your heater working so you can get back to enjoying your pool.

Related:

Pool Water Testing Near Me: Why It Matters and What to Expect
Pool Leak Repair: Signs You Have a Leak and What to Do
Pool Plaster Repair: Signs, Fixes, and When It’s Time to Resurface