Common Problem
Pool Heater Not Heating? Common Causes and Next Steps
Heater issues generally fall into ignition problems (won't fire) and performance problems (fires but no heat). In Orlando, heat pumps also lose capacity when overnight temps drop into the 50s during winter fronts. Both should be diagnosed by a qualified provider.
Most likely causes
- Low gas pressure
- Dirty flame sensor
- Scale on heat exchanger from hard water
- Bad thermistor or high-limit switch
- Refrigerant loss on coastal heat pump
What to do now
Verify filter pressure is normal and the pump is running. Then consider scheduling a heater diagnostic. Do not bypass safety switches.
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