Why did my pool heater suddenly stop working?

Common causes are a tripped safety switch from low water flow, a dirty filter restricting flow to the heater, a failed ignition component on gas units, or a compressor issue on heat pumps.

Can a pool heater be repaired the same day?

Often yes if the part is common and in stock on the truck. Less common parts or a full heat exchanger replacement may need to be ordered.

Is it worth repairing an old pool heater or replacing it?

If the heater is past 8-10 years old and needs a major component like a heat exchanger, most contractors will walk you through the cost comparison against a new unit before doing the repair.

Pool heater not working: same-day diagnosis and repair

A heater that won't fire is one of the more common urgent calls once Naples nights cool off in the winter months, especially for anyone using the pool daily or running a spa off the same system. The causes range from a tripped high-limit switch and dirty flow sensor to a failed ignition control board or a cracked heat exchanger.

A contractor should be able to pull an error code off the heater's display (most gas and electric heat pump units have one) and diagnose from there rather than guessing. Gas heater repairs often come down to igniters, thermocouples, or gas valves. Heat pump units more often fail on the compressor, fan motor, or refrigerant side. Either way, ask if they carry common parts on the truck, since heaters are one of the few pool components where a same-day fix genuinely depends on parts availability.

Ask what error code the heater is showing before the visit, if you can read the display
Confirm if they work on your brand (gas vs. heat pump repairs aren't always the same technician)
Ask whether a temporary fix (bypassing a bad sensor, for instance) is possible to get heat back same day while a part is ordered

What it costs

Simple fixes like a thermocouple, igniter, or pressure switch are on the lower end. Heat exchanger replacement or a compressor swap on a heat pump costs significantly more and sometimes approaches what a mid-range new unit would run, which is when a contractor should be telling you honestly whether repair or replacement makes more sense given the heater's age.

Top 3 by our score

Ranked from our published scoring of public Google reviews for pool repair & equipment.

1. Edgewater Pools & Spas | Main Office
4.9★ · 399 reviews

93
2. Caribbean Pools, Inc.
4.9★ · 313 reviews

92
3. Pool Troopers
4.8★ · 475 reviews

91

See the full ranking → · Browse all providers

FAQ

Why did my pool heater suddenly stop working?: Common causes are a tripped safety switch from low water flow, a dirty filter restricting flow to the heater, a failed ignition component on gas units, or a compressor issue on heat pumps.
Can a pool heater be repaired the same day?: Often yes if the part is common and in stock on the truck. Less common parts or a full heat exchanger replacement may need to be ordered.
Is it worth repairing an old pool heater or replacing it?: If the heater is past 8-10 years old and needs a major component like a heat exchanger, most contractors will walk you through the cost comparison against a new unit before doing the repair.

Enquiries submitted through our forms may be shared with partner providers who can perform the work, and we may receive a referral fee. Our rankings and scores are based only on our published method and are not influenced by referral fees.