Baxi Boiler Error Codes — Meanings, Causes & Repair in Greater Vancouver

Seeing a fault code on your Baxi boiler? This guide explains what the most common Baxi boiler error codes mean, what’s safe to check yourself, and when to call HeatLand’s licensed, TSBC-certified gas technicians for Baxi boiler repair across Metro Vancouver and the Fraser Valley.

The codes below apply across common Baxi models (Luna, Duo-tec, Nuvola). Meanings follow Baxi’s documented fault codes — always confirm against your unit’s own manual, because exact wording can vary by model, control board and firmware.

How to read Baxi boiler error codes

Baxi displays a fault as an 'E' prefix followed by a number (e.g. E110, E133, E160). On the boiler controller the number appears with a wrench/service icon; resettable faults can be cleared by turning the selector to the Reset position for at least 5 seconds. Baxi's North American service documentation lists the codes as bare numbers (e.g. '110'), which correspond to the E-codes shown on the display. Active codes vary by model and software version.

Baxi boiler error codes & what they mean

These are the Baxi boiler codes our Greater Vancouver technicians see most. Anything marked pro repair involves gas, electrical, sealed-combustion or control-board work that must be done by a licensed gas technician (TSBC-certified in BC) — never open gas or electrical components yourself.

Code	What it usually means	Common causes	Safe to check yourself
E09	Gas valve connection fault (wiring/connection between the gas valve and the PCB) pro repair	loose or disconnected gas valve wiring connector; damaged wiring harness to the gas valve; faulty PCB	confirm power to the boiler is on; do not open the gas valve or any wiring; this requires a licensed technician; try a single reset if the code is resettable
E10	Outdoor temperature sensor fault (open or short circuit) pro repair	faulty outdoor sensor; break or short in the outdoor sensor wiring; faulty PCB	if an outdoor sensor is fitted, no homeowner-safe action – call a licensed technician; try a single reset if the code is resettable
E15	Gas valve command fault (electronic control of the gas valve) pro repair	faulty gas valve wiring harness; faulty gas valve; faulty PCB	do not attempt gas-side checks; call a licensed technician; try a single reset if the code is resettable
E20	Central heating (flow/supply) NTC temperature sensor fault pro repair	faulty CH NTC sensor (out of calibration); loose or broken sensor wiring; faulty PCB	press reset once if the code is resettable; if it recurs, call a licensed technician
E28	Flue / heat exchanger NTC (flue high-limit) sensor fault pro repair	loose connection at the flue high limit and control board; short in the wiring harness; faulty flue sensor	press reset once if the code is resettable; if it recurs, call a licensed technician
E40	Return NTC temperature sensor fault pro repair	faulty return NTC sensor (out of calibration); loose or broken sensor wiring; faulty PCB	press reset once if the code is resettable; if it recurs, call a licensed technician
E50	Domestic hot water (DHW) NTC supply sensor fault pro repair	faulty DHW NTC sensor (out of calibration); loose or broken sensor wiring; faulty PCB	press reset once if the code is resettable; if it recurs, call a licensed technician
E53	Obstruction in the flue pipe / flue blockage pro repair	blocked or obstructed flue/vent; vent not sloped back toward the boiler (dips trapping condensate); pinched gasket on the inner (exhaust) pipe of a concentric vent	check the outside flue terminal for visible obstruction (snow, debris, nests) from a safe position; do not open or dismantle the flue; call a licensed technician; try a single reset if the code is resettable
E55	PCB not programmed (electronic board not configured / parameter data not loaded) pro repair	memory stick not connected properly to the PCB after a board replacement; incomplete PCB programming during service	no homeowner-safe action; this occurs after a board replacement and needs a licensed technician
E83	Communication problem between the boiler PCB and the control unit / room unit (eBUS/M2 bus). Also reported as E84, E85, E86, E87 pro repair	wiring fault between the modulating room unit and the M2 bus terminals; short circuit in the bus wiring; faulty control unit or PCB	check the room control/thermostat batteries if applicable; restore power at the isolator and allow communication to re-establish; if it recurs, call a licensed technician
E109	Pre-circulation alarm (temporary fault) – insufficient water circulation detected before firing pro repair	pump not running / seized or sticking; restriction or blockage in the boiler or system; air not fully purged from the system	read the pressure gauge and top up via the filling loop per the user manual if low; ensure system/radiator isolation valves are open; try a single reset if the code is resettable
E110	Safety thermostat (high-limit) tripped due to over-temperature of the primary water pro repair	poor circulation (seized pump or impeller not spinning); restrictions/blockage in the system; air trapped in the system	check the system pressure gauge is in the normal range; ensure radiator/system valves are open so water can circulate; turn the selector to Reset for at least 5 seconds (single reset)
E118	Hydraulic (system water) pressure too low pro repair	low system pressure / water loss from a leak; air in the system or closed shutoff valve; expansion tank not correctly pressurized	read the pressure gauge; if low, top up via the filling loop per the user manual (typical target around 12-15 psi / ~1 bar cold); look for visible leaks around the boiler, pipework and radiators; ensure shutoff valves are open
E119	Water pressure switch not operated (primary water pressure below ~0.5 bar / low-pressure switch open) pro repair	low system pressure / water loss; faulty water pressure switch; air-lock or closed valve	read the pressure gauge; if low, top up via the filling loop per the user manual; look for visible leaks; try a single reset after re-pressurising
E125	Circulation fault (primary circuit) – no circulation of water detected pro repair	pump not running or seized; restriction/blockage in the system; wiring to the pump disconnected or broken	check the pressure gauge and top up if low per the user manual; ensure system/radiator valves are open; try a single reset; if E125 recurs, call a licensed technician
E128	Loss of flame during operation (flame detected then lost while running) pro repair	flame sensor gap incorrect, dirty or damaged; loose flame-sensor wiring or broken wire; incorrect polarity / poor grounding	confirm the gas supply is on and other gas appliances work; try a single reset (do not reset repeatedly); if it recurs, call a licensed technician
E130	Flue NTC sensor tripped due to over-temperature (flue gases too hot) pro repair	seized pump / poor circulation causing high temperature; blocked or restricted heat exchanger; pinched vent gasket or vent not sloped/supported (dips)	check the system pressure gauge is in the normal range; check the outside flue terminal for visible obstruction from a safe position; turn the selector to Reset for at least 5 seconds (single reset)
E131	Thermal fuse (thermo-fuse) tripped due to over-temperature pro repair	over-temperature event at the primary heat exchanger; faulty/blown thermal fuse; damaged or fouled primary heat exchanger	check the system pressure gauge reading; no homeowner-safe internal action; call a licensed technician; try a single reset if the code is resettable
E133	Ignition failure – no spark, no flame, or no flame signal (also covers interruption of gas supply / flame failure) pro repair	gas supply off, gas line not purged of air, or low gas pressure; faulty spark/ignition electrode or wiring; incorrect electrode spacing	confirm the gas supply is on and other gas appliances work; check the condensate drain is not blocked or frozen; turn the selector to Reset for at least 5 seconds (single reset, no more than 2-3 attempts)
E134	Gas supply valve blocked / elapsed time with gas valve open but no gas pro repair	gas valve fault; gas supply interruption; faulty PCB	confirm the gas supply is on and other gas appliances work; do not attempt gas-side checks; call a licensed technician; try a single reset if the code is resettable
E135	Internal (electronics) error pro repair	polarity/grounding issue or boiler not on a dedicated circuit; water or water residue on the PCB; faulty PCB	restore power at the isolator and try a single reset; if it recurs, call a licensed technician
E160	Fan fault (fan not running at the correct speed or no fan feedback) pro repair	loose fan wiring at the fan or PCB connectors; seized or sticking fan; no supply voltage to the fan	try a single reset if the code is resettable; no internal access; call a licensed technician if it recurs
E162	Incorrect power supply frequency (mains Hz mismatch). Also reported as E317 pro repair	boiler parameter set for the wrong mains frequency (50/60 Hz); unstable or out-of-spec mains supply	no homeowner-safe action; this is a configuration/supply issue for a licensed technician; try a single reset if the code is resettable
E169	Flue / air pressure switch fault (contact stays open) pro repair	blocked vent or excessive vent length; vent sagging / not sloped or supported correctly; low or fluctuating inlet gas pressure	check the outside flue terminal for visible obstruction (snow, debris) from a safe position; try a single reset if the code is resettable; if it recurs, call a licensed technician
E193	Pre-circulation fault / circulation error (air or insufficient flow detected at startup; often self-clears) pro repair	air in the system; temporary low flow / poor circulation; low system pressure	check the pressure gauge and top up if low per the user manual; ensure system/radiator valves are open; try a single reset if the code persists

Baxi boiler codes we get called for most

E133 — Ignition failure – no spark, no flame, or no flame signal (also covers interruption of gas supply / flame failure)

Typical causes include gas supply off, gas line not purged of air, or low gas pressure; faulty spark/ignition electrode or wiring; incorrect electrode spacing. A few things are safe to check yourself (confirm the gas supply is on and other gas appliances work; check the condensate drain is not blocked or frozen), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes E133 on Baxi boilers throughout Greater Vancouver.

E118 — Hydraulic (system water) pressure too low

Typical causes include low system pressure / water loss from a leak; air in the system or closed shutoff valve; expansion tank not correctly pressurized. A few things are safe to check yourself (read the pressure gauge; if low, top up via the filling loop per the user manual (typical target around 12-15 psi / ~1 bar cold); look for visible leaks around the boiler, pipework and radiators), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes E118 on Baxi boilers throughout Greater Vancouver.

E28 — Flue / heat exchanger NTC (flue high-limit) sensor fault

Typical causes include loose connection at the flue high limit and control board; short in the wiring harness; faulty flue sensor. A few things are safe to check yourself (press reset once if the code is resettable; if it recurs, call a licensed technician), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes E28 on Baxi boilers throughout Greater Vancouver.

E160 — Fan fault (fan not running at the correct speed or no fan feedback)

Typical causes include loose fan wiring at the fan or pcb connectors; seized or sticking fan; no supply voltage to the fan. A few things are safe to check yourself (try a single reset if the code is resettable; no internal access; call a licensed technician if it recurs), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes E160 on Baxi boilers throughout Greater Vancouver.

Is it safe to keep running a Baxi boiler with a fault code?

Most Baxi fault codes put the boiler into a safe lockout for a reason. You can safely check the basics — gas supply on, power on, the thermostat calling for heat, system pressure in the normal range, and the condensate drain not frozen or blocked (a common cause in Vancouver cold snaps) — and restart it once. If the code returns, stop and book a technician. If you ever smell gas, leave the building and call your gas utility’s emergency line or 911 first. If a carbon-monoxide alarm sounds, get everyone out and call 911.

Baxi boiler repair across Greater Vancouver

HeatLand has kept Metro Vancouver homes comfortable since 1999. Our licensed, insured technicians diagnose and repair Baxi boilers — ignition faults, flame and sensor errors, low-pressure and pump problems, fan and flue faults, and control-board issues — including units we didn’t install. We’re brand-agnostic, carry common parts, and give you an honest repair-or-replace assessment with upfront pricing and a free estimate. If your boiler is beyond economical repair, we’ll show you right-sized, high-efficiency replacement options and the rebates available.

Need it sorted fast? We offer priority emergency boiler repair. Explore Boiler services, browse all boiler error codes by brand, or request a free estimate.

Baxi boiler service areas

We repair Baxi boilers across Greater Vancouver and the Fraser Valley, including:

Baxi boiler error code FAQs

Can I reset my Baxi boiler myself?

Yes — power-cycling the reset button once is generally safe after you’ve checked the basics (gas supply on, power on, the thermostat calling for heat, system pressure in the normal range, and the condensate drain not frozen or blocked (a common cause in Vancouver cold snaps)). If the boiler faults again right away, stop and note the code — repeatedly resetting a boiler that keeps locking out can mask a real problem. Call a licensed, TSBC-certified gas technician to diagnose it.

What does the Baxi E10 code mean?

On Baxi boilers, E10 commonly indicates outdoor temperature sensor fault (open or short circuit). Confirm the exact meaning against your unit’s manual — codes can vary by model and series — and have the repair done by a licensed, TSBC-certified gas technician. HeatLand fixes this across Greater Vancouver.

Do you repair Baxi boilers you didn’t install?

Yes. HeatLand is brand-agnostic and services Baxi boilers throughout Metro Vancouver and the Fraser Valley, whether or not we installed the unit. We carry common parts and give you an honest repair-or-replace assessment.

Is a Baxi boiler fault code an emergency?

No heat in cold weather is worth treating urgently. If you ever smell gas, leave the building and call your gas utility’s emergency line or 911 first. If a carbon-monoxide alarm sounds, get everyone out and call 911. For priority boiler repair across Greater Vancouver, call (604) 330-3812.

How much does Baxi boiler repair cost in Vancouver?

It depends on the fault. Many Baxi codes point to sensors, ignition or pump parts — usually far cheaper than replacement. We give upfront pricing and a free estimate before any work.

More Boiler error-code guides

HeatLand repairs every major boiler brand across Greater Vancouver. More brand guides: