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Pool heater failures usually have a clear mechanical cause. Here are the problems property owners bring to us most often, and what is actually behind them.

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Pool Heater Fires But Shuts Off Within Seconds

This usually points to a flame sensor that has stopped sending a hold signal to the control board, causing the board to shut down the gas valve immediately after ignition. It can also result from insufficient gas pressure at the manifold, which causes the flame to drop below the sensor's detection threshold. We test the ignition sequence from spark through flame hold to identify exactly where the cycle is breaking down.

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Pool Water Not Reaching Set Temperature

A heater that runs full cycles but fails to bring the water to temperature is most often dealing with heat exchanger scaling from calcium deposits. Scale buildup on the heat exchanger tubes acts as insulation, reducing how much heat transfers from the burner to the pool water. Descaling the heat exchanger or, in more advanced cases, replacing it restores the heat transfer efficiency the unit was designed to deliver.

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Same Error Code Keeps Coming Back

A fault code that keeps returning after reset is a sign that the triggering condition has not been resolved. The most common repeat faults involve flow switch signals, high-limit switch trips from restricted water circulation, and pressure switch faults from air in the line or a degraded switch membrane. Diagnosing the actual component behind the code, rather than resetting the board and hoping, is the only way to stop the cycle.

Gas Smell Near the Pool Heater

A gas odour near the heater is a condition that requires immediate shutdown and professional inspection before the unit is run again. The most common sources are a gas valve not seating fully, a loose or corroded fitting on the supply line, or a burner manifold connection that has degraded over time. This is not a symptom to monitor, it is a symptom to address that day.

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Water Pooling Under the Pool Heater

Water beneath the heater usually indicates either a cracked heat exchanger allowing pool water to bypass internally and exit through cabinet seams, or a failed plumbing connection at the inlet or outlet fittings. A cracked heat exchanger typically requires replacement of the component. The source of the leak determines whether the repair is internal to the heater or at the plumbing connections outside the cabinet.

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Pool Heater Running Constantly Without Shutting Off

A pool heater that runs without cycling off is either working against a heat exchanger too scaled to transfer heat effectively, operating in conditions where the pool volume or temperature differential exceeds the unit's designed output, or has a thermostat or control board fault causing it to misread the current water temperature. Continued operation in this state accelerates component wear and increases the risk of a high-limit fault trip.

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Pool Heater Overheating and Tripping Safety

The high-limit switch trips when the heat exchanger temperature exceeds a safe threshold, which can be caused by restricted water flow through the unit, a scaled heat exchanger reducing internal flow, or a dirty pool filter limiting circulation pump output. A high-limit switch that has drifted out of calibration can also trip at temperatures below the actual safety threshold. We check water flow rate, filter condition, and heat exchanger condition before testing the switch itself.

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Pool Heater Won't Ignite at All

A complete failure to ignite can originate at the igniter, the pilot assembly, the gas valve, or the control board. If the ignition spark is audible but no flame follows, the gas valve or gas supply is the likely source. If no spark occurs, the igniter itself or its wiring connection is where the fault typically sits. A systematic test of each component in the ignition sequence identifies the failure point without unnecessary parts replacement.

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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 to internal components, 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 indoor 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

★★★★★

Actually checked credentials before hiring

I called three companies and Gas Services Edmonton was the only one that clearly explained their gas licensing without me having to ask twice. The technician found a failed ignitor in under twenty minutes and had it fixed the same visit.

★★★★★

Caught a venting issue we didn't know about

We thought we just needed a new thermostat but the technician found our venting was slightly out of code from a previous installer. Genuinely glad they caught it during the same visit instead of just fixing the obvious symptom.

★★★★☆

Great repair, heat exchanger part took time

Our heater needed a specific manufacturer part that took almost a week to arrive since our model is older. The technician kept us updated throughout and the repair itself was done well once the part showed up.

★★★★★

Honest about repair versus replacement math

Our heater is almost 11 years old and the technician was upfront that the heat exchanger repair would cost nearly as much as a new unit. Really appreciated the honest breakdown instead of just pushing the more expensive repair.

★★★★★

Heat pump diagnosed correctly first time

A previous company tried an electrical fix on our heat pump that didn't work. Gas Services Edmonton brought the right gauges and found it was actually a refrigerant issue. Fixed properly on the first visit.

★★★★★

Fast response during a cold week

Our pool was ice cold right before a family gathering and Gas Services Edmonton got a technician out within two days. Clear explanation of the diagnostic, fair pricing, and the pool was warm again well before our guests arrived.

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