Baxi E110: Overheat Thermostat Lockout
What the Baxi E110 error code means, what causes it, and why it's a job for a licensed BC gas technician — not a DIY reset.
Severity
High — needs prompt professional attention
What the Baxi E110 error code means
The overheat (limit) thermostat tripped because boiler temperature was too high.
On Baxi combi and system condensing series, E110 is a over-temperature / high-limit. It is a protective response — the boiler is telling you something needs attention, and the safe, lasting fix is a proper diagnosis rather than repeated resets.
Symptoms you may notice
- Boiler locks out under load
- Hot or burning smell near the unit
- Heat that starts then cuts out
Common causes of Baxi E110
Why this is not a DIY fix
An overheat lockout is a protective trip — the boiler is telling you heat is not moving away from the heat exchanger fast enough. Running it repeatedly risks cracking the heat exchanger (an expensive, sometimes total-loss failure). The root cause (circulation, blockage, or a failed sensor) must be found by a technician before the unit is returned to service.
In British Columbia, gas work must be performed by a TSBC-licensed gas fitter. GasBoilers.ca — a CanroHeat division — sends Red Seal–certified, gas-licensed technicians who diagnose the true cause, repair it correctly, and verify safe operation before they leave.
How our technicians diagnose & repair it
- 1Check circulation: pump operation, air-bound zones, closed valves and flow rate
- 2Inspect the heat exchanger and strainer for blockage or scale
- 3Test the high-limit and supply/return temperature sensors
- 4Confirm correct system pressure and bleed trapped air
Related Baxi codes
Baxi E110 — FAQ
What does the Baxi E110 error code mean?
The overheat (limit) thermostat tripped because boiler temperature was too high. On Baxi combi and system condensing series, this is categorised as a over-temperature / high-limit.
What causes Baxi E110?
The most common causes are: Poor circulation; Pump fault; Air-bound system; Sensor fault. A licensed technician confirms which one applies before any part is replaced.
Can I fix Baxi E110 myself?
No. An overheat lockout is a protective trip — the boiler is telling you heat is not moving away from the heat exchanger fast enough. Running it repeatedly risks cracking the heat exchanger (an expensive, sometimes total-loss failure). The root cause (circulation, blockage, or a failed sensor) must be found by a technician before the unit is returned to service. Repeatedly resetting the boiler without fixing the root cause can be unsafe and can cause further damage. Call GasBoilers.ca at 604-359-1081 for a licensed diagnosis.
Is the Baxi E110 error code dangerous?
This is a protective fault — the boiler has shut down a function to protect itself. It is best diagnosed promptly by a licensed technician so the underlying cause does not lead to a more expensive failure.
How much does it cost to fix Baxi E110 in Greater Vancouver?
Cost depends on the root cause and any parts needed. We start with a flat-rate diagnostic, then quote the repair before any work begins — no surprises. Call 604-359-1081 for current pricing and same-day availability.
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Baxi showing E110? We'll fix it right.
Licensed, Red Seal–certified gas technicians across Greater Vancouver. Upfront pricing, same-day service available.