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We have seen every issue a gas pool heater can develop. Here are the problems our clients call us about most often.

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Pool Heater Won't Turn On at All

A heater that does not respond to the thermostat is often caused by a failed thermocouple or thermopile preventing the gas valve from opening, a tripped high-limit switch, or an ignition lockout after repeated failed attempts. Running through a reset without understanding why the lockout occurred leads to repeated failures. We diagnose the root cause and repair the specific component so the heater starts reliably.

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Pool Stays Cold Despite Heater Running

When the heater fires and runs but the pool water temperature barely moves, the problem is usually a scaled or corroded heat exchanger that cannot transfer combustion heat efficiently. A partially blocked burner or a gas supply pressure issue can produce the same symptom. We inspect the heat exchanger, burner, and gas pressure as a combined diagnostic to find the actual cause.

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Pool Heater Turns Off After a Few Minutes

Short cycling is most commonly caused by a weak thermopile that cannot sustain enough voltage to keep the gas valve open, or by a flow switch that cuts out when water flow drops slightly during the cycle. Safety shutdowns from overtemperature sensors can also produce this symptom. We test each component in the shutdown sequence to confirm which one is ending the cycle prematurely.

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Pool Heater Pilot Light Won't Stay Lit

A pilot that lights but will not hold is almost always a thermocouple issue. The thermocouple measures the pilot flame temperature and signals the gas valve to stay open. When it degrades, the signal weakens and the valve closes as a safety response. Thermocouple replacement is a quick repair that restores reliable pilot function in most cases.

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Loud Banging or Popping at Pool Heater Ignition

A bang or thud at ignition usually means gas has accumulated in the combustion chamber before the igniter fires, which produces a delayed ignition event. A dirty or partially blocked burner, a weak igniter, or a gas valve that opens slowly are common causes. We clean the burner, test the ignition timing, and address any gas delivery issues to eliminate the problem safely.

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Water Leaking From Pool Heater Cabinet

Leaking from the heater base typically points to a cracked heat exchanger tube, a failed header gasket, or a loose plumbing connection at the inlet or outlet. Even a small leak should not be ignored, since pool water entering the combustion chamber damages the burner and control board quickly. We identify the source and repair it before the damage spreads.

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Pool Heater Error Codes Keep Coming Back

Recurring fault codes after a reset usually mean the condition triggering the code has not been corrected. Flow faults, pressure errors, and ignition lockouts that return within a short time indicate an underlying mechanical or sensor issue. We review the full fault history, test the flagged systems, and repair the component actually responsible rather than simply clearing the display.

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Gas Smell Near the Pool Heater

Any gas odour near the pool heater should be treated as urgent. The source may be a loose fitting on the gas connection, a corroded union, or a gas valve not fully closing when the heater is off. Do not attempt to operate the heater or locate the leak yourself. Our licensed technicians carry detection equipment to identify the source safely and complete the repair with all required leak testing before leaving.

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Pool Heater Won't Start After Winter

A heater that shut down normally in the fall but will not restart in spring has often been affected by freeze damage, condensation reaching electrical connections over winter, or a control board that failed during storage. This is one of the most common calls we receive at the start of pool season. We inspect the full system at startup, identify what failed over winter, and get the heater running before the season is underway.

Reviews

What Our Customers Say

★★★★★

Extended our swim season by weeks

We used to close the pool by early September but the new heater has us swimming comfortably well into October now. Gas Services Edmonton sized it correctly the first time based on our actual pool dimensions.

★★★★☆

Great heater, gas line took extra days

Our existing gas line was not big enough so a new one had to be run, which added a few days to the timeline. The final result works perfectly and heats up fast every time we want to swim.

★★★★★

Honest comparison of heater types

We were torn between a heat pump and gas and the technician from Gas Services Edmonton walked us through the real tradeoffs for our situation instead of pushing one option. Gas made more sense for how we actually use the pool and we are happy with the choice.

★★★★★

Recommended a cover and it made a real difference

The technician suggested pairing the new heater with a pool cover to cut running costs. Our gas bills are noticeably lower than we expected and the pool stays warmer overnight too.

★★★★★

Clean, professional installation

Everything from the gas pressure test to the final combustion check was explained clearly before they left. Our old heater used to short cycle constantly and this new setup runs smooth and quiet.

★★★★★

Spring startup caught an issue before it became a problem

We signed up for the spring startup visit this year and Gas Services Edmonton found a worn igniter that would have failed within weeks. Heater has run without a single hiccup since.

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From gas furnaces and fireplaces to pool heaters and tankless water heaters, our certified technicians keep your home safe, warm, and running right.

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