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Recurring Tankless Water Heater Maintenance Problems We Deal With

We have serviced hundreds of tankless units across the area. These are the issues our clients call about most often.

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Tankless Heater Not Heating as Well Anymore

Mineral deposits accumulate on the heat exchanger coil over time, insulating it and forcing the system to burn more gas for the same output. Left untreated, severe scale can crack the exchanger entirely. We perform a complete descaling flush to restore full heat transfer efficiency.

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Tankless Heater Inlet Filter Blocked

The inlet filter traps sediment before it enters the heat exchanger, but it needs regular cleaning to do its job. A blocked filter restricts water flow, causing reduced output pressure and triggering flow-related error codes. We clean and inspect the filter on every maintenance visit.

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Tankless Heater Recurring Error Codes

Error codes that keep returning after a reset usually point to an underlying issue: a dirty heat exchanger, a failing sensor, or a combustion problem the system has flagged. We pull the error history, diagnose the root cause, and clear the issue rather than just resetting the display.

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Tankless Heater Fluctuating Hot Water Temperature

Water that runs warm, drops cold, and takes time to recover is usually a sign of a dirty flow sensor or significant scale buildup affecting the heat exchanger response. Ignoring it puts extra strain on the burner system. We clean the sensor, flush the exchanger, and restore consistent temperature delivery.

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Tankless Heater Venting Blocked or Corroded

Blocked or corroded venting causes incomplete combustion, which reduces efficiency, raises carbon monoxide risk, and can trigger automatic unit shutdowns. We inspect the full vent path for blockages, corrosion, and loose connections and correct any issues found during the visit.

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Tankless Heater Pressure Relief Valve Leaking

A pressure relief valve that leaks, sticks open, or does not release under pressure is both an efficiency problem and a safety risk. We test the valve function on every maintenance visit and replace it if it no longer operates within safe parameters.

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Tankless Heater Ignition or Flame Sensor Failing

A unit that fails to ignite consistently or shuts off mid-cycle often has a dirty or worn flame sensor, a faulty igniter, or a gas pressure issue. These components directly affect whether your unit starts and stays running safely. We test ignition and burner performance as part of every standard maintenance visit.

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Tankless Heater 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 maintenance visit and address what needs correction.

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No Hot Water at All

A complete loss of hot water usually points to an ignition lockout, a tripped safety switch, or a gas supply interruption that has prevented the unit from firing. Forcing a reset without diagnosing the cause can allow the underlying fault to worsen. We identify the root cause and restore full operation safely.

Reviews

What Our Customers Say

★★★★★

Thorough service, explained everything clearly

The technician from Winnipeg Service Pros walked me through the whole process before starting, which I really appreciated. He found a partially clogged filter I had no idea about and cleared it as part of the visit. The hot water has been more consistent since. I will be booking annual service going forward.

★★★★★

Fast, professional, no surprises

I called to book maintenance after noticing our water was taking longer to heat than it used to. The technician arrived on time, completed the descaling flush and full inspection in about 90 minutes, and told me exactly what he found. Pricing was exactly what was quoted. No upselling, no drama. Good service.

★★★★☆

Great work, had to wait a day for the appointment

Winnipeg Service Pros did a thorough job on our tankless unit, which had not been serviced in a couple of years. The technician was knowledgeable and patient with my questions. I had hoped to get same-day availability but the next opening was the following morning, which worked out fine in the end.

★★★★★

Unit runs like new after the flush

Our water heater was throwing error codes and the hot water had been inconsistent for months. One maintenance visit later and the problem is completely gone. The technician explained that scale buildup on the heat exchanger was the culprit and showed me what was removed during the flush. Really glad I called when I did.

★★★★★

Reliable, honest, and on time

I have used Winnipeg Service Pros twice now for annual maintenance on our tankless water heater. Both times the technician has been on time, professional, and completely upfront about what the service covers. They keep records of each visit too, which is helpful since our unit is still under warranty.

★★★★★

Would highly recommend for annual service

Our tankless heater is several years old and Winnipeg Service Pros has been maintaining it for the last two years. Each visit is consistent: thorough, professional, and done in about an hour and a half. I notice the difference in water temperature consistency after every service. Worth every dollar.

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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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