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Tankless systems fail in recognizable patterns. These are the problems our technicians are called out to fix most often.

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No Hot Water Output

When the unit fails to produce any hot water, the most likely causes are igniter failure, a tripped thermal safety limit from overheating, or a disruption in the gas supply. Continuing to cycle the unit without diagnosing the fault can cause secondary damage to the control board and heat exchanger. We identify the root cause before replacing any part to avoid unnecessary costs.

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Temperature Drops Mid-Shower

Sudden shifts between hot and cold water during use typically point to a failing flow sensor, a partially blocked heat exchanger, or a gas valve that cannot maintain steady flow under demand. Running the unit in this state accelerates wear across the burner and heating components. A diagnostic visit identifies which component is responsible and corrects the issue before secondary damage develops.

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Tankless Error Code Will Not Clear

Persistent error codes that return after a manual reset indicate an active fault the unit cannot self-correct. Each code corresponds to a specific component or operating condition, and resetting without addressing the cause leads to more frequent shutdowns over time. Our technicians trace the fault to its source using manufacturer-specific diagnostic procedures rather than guessing at the cause.

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Tankless Hot Water Pressure Has Dropped

Reduced flow from a tankless unit is most often caused by a clogged inlet filter, mineral buildup in the heat exchanger passages, or a flow sensor misreading water demand. Low flow can also prevent the unit from activating at all, since most tankless systems require a minimum threshold to trigger the burner. We clean, test, and replace components as needed to restore full output.

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Tankless Unit Ignites Then Shuts Off

A unit that fires and then shuts down within seconds usually has a combustion safety issue, a venting restriction preventing proper exhaust draw, or a flame sensor not confirming the burner correctly. This behavior is a built-in safety response, but it leaves the home without hot water and should not be reset repeatedly without diagnosis. We inspect the venting, combustion chamber, and flame detection system to find the cause.

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Unusual Sounds During Tankless Startup or Operation

Clicking that does not resolve into a flame, rumbling during heating, or banging sounds from inside the unit are all signs that something is working harder than it should. Scale buildup in the heat exchanger, loose internal components, and ignition faults are common sources of abnormal noise. Leaving these unaddressed tends to accelerate the underlying issue toward a complete failure.

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Tankless Unit Overheats and Shuts Down Repeatedly

Repeated thermal shutdowns occur when the heat exchanger cannot transfer heat efficiently due to scale buildup, when airflow through the unit is restricted, or when the venting system is not drawing combustion gases out at the required rate. Cycling the unit through repeated shutdowns shortens the service life of internal components quickly. We inspect the full heat path and vent system to identify the restriction and correct it.

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Tankless System Fails to Fire in Cold Weather

Tankless units can fail to start or operate normally in winter due to frozen condensate lines, ice-restricted outdoor venting, or gas pressure fluctuations when demand across the supply line is high. Cold-climate operating conditions create vulnerabilities in venting and condensate management that are not visible during warmer months. We assess the full cold-weather setup and make the corrections needed to keep the system running through the season.

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Tankless Unit Not Serviced in Over a Year

A tankless water heater that has gone more than a year without professional service may have heat exchanger scale, inlet filter buildup, and ignition component wear that compound quietly. The risk of a mid-season lockout or error code increases with each season skipped. We assess the full unit condition during a catch-up visit and address what needs correction.

Reviews

What Our Customers Say

★★★★★

Talked us out of an unnecessary replacement

We assumed our nine year old unit needed to be replaced entirely. The technician diagnosed a single failed control board instead and had it fixed the same afternoon. Saved us thousands compared to what we expected to pay.

★★★★★

Found the real cause instead of a quick patch

A previous company had replaced our flow sensor twice and it kept failing. Gas Services Edmonton traced it back to hard water scale nobody had addressed and fixed the actual problem this time.

★★★★☆

Solid repair, quote was a bit higher than expected

The diagnosis was thorough and the technician explained everything clearly, but the final cost ended up a little higher once they found a second worn part during the visit. Still reasonable for the work involved and it has run great since.

★★★★★

Straight answer on repair versus replace

I called expecting to be upsold on a new unit and instead got an honest breakdown of both options with real numbers. Went with the repair and it has worked perfectly for months now.

★★★★★

Knew our brand inside and out

The technician from Gas Services Edmonton recognized our unit's fault code immediately and had the right replacement part on the truck. No guessing, no wasted trip, just a fast and correct fix.

★★★★★

Caught a warranty issue we didn't know about

Gas Services Edmonton checked our maintenance records and found our heat exchanger was still under warranty, which saved us a significant amount on the part. Really appreciated them checking before just quoting full price.

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