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Gas pool heaters fail in predictable ways. Here are the repair situations our technicians handle most often for homeowners.

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Pool Heater Won't Start or Hold a Flame

Startup failure is most often caused by a thermocouple or thermopile that can no longer produce enough millivoltage to hold the gas valve open, a fouled pilot assembly, or a gas supply issue. The failure may be intermittent at first before becoming consistent. We test ignition component output and gas pressure as the first steps in every startup diagnostic, and most cases are resolved with a single component replacement.

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Pool Taking Much Longer to Heat

Reduced heating efficiency is usually caused by scale buildup inside the heat exchanger, a bypass valve diverting too much water around the heat exchanger, or a burner not producing the correct flame pattern. Each of these causes requires a different repair, so a diagnostic that tests all three is the correct starting point. We run combustion analysis, check bypass position, and assess heat exchanger condition before recommending the appropriate repair.

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Pool Heater Shuts Off Before Reaching Temperature

A heater that repeatedly shuts off mid-cycle is most often tripping the high-limit switch due to restricted water flow or a control board fault. Restricted flow is caused by a misconfigured bypass valve, a clogged filter, low pump output, or undersized plumbing. We test water flow rate and bypass position before resetting the high-limit, because resetting it without correcting the flow problem causes the cycle to repeat.

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Water Leaking From the Pool Heater

Leaks can originate from external fittings, the pressure relief valve, bypass valve seals, or internal heat exchanger corrosion. Each source requires a different repair approach. We inspect all external connections first, then open the cabinet to trace internal leak sources systematically. After the repair, we pressure test the full circuit before closing the job.

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Pool Heater Heat Exchanger Corroded or Leaking

Heat exchanger failure is caused by aggressive pool water chemistry that dissolves the copper tubing from the inside over multiple seasons. A pitted or perforated exchanger allows pool water and combustion gases to interact, which is both an efficiency problem and a safety concern. We test water chemistry as part of every heat exchanger repair because correcting the chemistry is what prevents the same damage from recurring.

Pool Heater Gas Valve or Ignition Failure

A failed gas valve prevents fuel from reaching the burner even when all other startup conditions are met. Ignition components including thermocouples, thermopiles, and spark igniters have finite service lives and commonly fail after several seasons. All gas valve and ignition work is completed by our licensed gas technicians under the credentials required for this type of repair in Edmonton.

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Pool Heater Control Board Fault or Shutdown

A faulty control board may produce error codes, refuse to initiate the startup sequence, or shut the system down partway through the heating cycle. Before replacing the board, we test all upstream sensors and switches to confirm the board itself has failed rather than a connected component. Replacing a board that is responding correctly to a failing sensor wastes money and leaves the real problem in place.

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Pool Heater Burner Producing Weak or Uneven Flame

A burner that produces an uneven or low flame is usually suffering from clogged ports, a gas pressure drift, or combustion air restriction. Poor combustion reduces heating output and puts uneven thermal stress on the heat exchanger. We clean the burner assembly, perform combustion analysis, and adjust gas pressure to specification to restore full heating capacity and protect the heat exchanger.

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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

★★★★★

Honest about repair versus replace

Another company told us we needed a whole new heater. Gas Services Edmonton found a single failed igniter instead and had it fixed the same visit. Saved us thousands and the heater has worked perfectly since.

★★★★☆

Good repair, part took a couple days

Our gas valve needed to be special ordered so we waited two extra days, but the technician kept us informed the whole time. The repair itself was quick once the part arrived and the heater runs great now.

★★★★★

Explained why replacement made sense this time

Our fourteen-year-old heater had a failed heat exchanger and I expected them to just fix it. Gas Services Edmonton walked me through why repair cost nearly matched a new unit and helped me pick a replacement instead.

★★★★★

Checked our warranty before charging us

I didn't realize our heater still had warranty coverage on the heat exchanger. The technician checked before quoting anything and it saved us a significant amount on the repair.

★★★★★

Fast fix for a flame sensor issue

Our heater kept shutting off seconds after lighting. Turned out to be a simple flame sensor cleaning and the technician had it done within the hour. Gas Services Edmonton did not try to sell us anything we didn't need.

★★★★★

Gave us real numbers to decide with

We were torn on repair versus replace for our heat pump. They gave us actual cost comparisons for both options instead of just pushing one path. Made the decision much easier and we felt confident either way.

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