Baxi E162 Fault Code: Causes, Fixes & Repair Costs
What does the Baxi E162 fault code mean?
The E162 code is one of a family of Baxi fan-related faults (E160–E163) and indicates a problem with the boiler's flue fan — specifically, either an incorrect fan speed reading or a permanent fan fault where the fan rotor may be seized, blocked, or its wiring is damaged. The fan is safety-critical: it draws fresh air into the combustion chamber and expels exhaust gases (including carbon monoxide) through the flue. When the boiler's control system detects that the fan isn't behaving as expected, it shuts the boiler down as a precaution and locks it out until the fault is properly resolved.
General guidance only — not a substitute for professional advice, and not certified by a Gas Safe engineer. Always have your specific appliance assessed by a qualified professional. Any gas work must be carried out by a Gas Safe registered engineer. If you smell gas or suspect carbon monoxide, leave the property and call the National Gas Emergency line on 0800 111 999.
Common causes
- Worn or failed fan motor Common
The fan motor is a mechanical component that degrades over time. A motor that has burnt out, seized due to bearing failure, or simply reached the end of its service life will either spin too slowly or not at all, triggering E162 immediately.
- Seized fan due to debris build-up Common
Dust, fluff, and general boiler cupboard debris can accumulate on the fan impeller over years of operation. If enough builds up, the fan blade can become physically jammed, causing the control board to detect zero or incorrect speed.
- Loose or damaged wiring and harness Common
The wiring loom that connects the fan motor to the PCB can chafe, corrode, or work loose — especially on older boilers. A poor connection means the board either can't control the fan speed or can't read the tachometer feedback signal accurately.
- Flue or air intake blockage Sometimes
A bird's nest, leaves, or other debris blocking the flue terminal forces the fan to work much harder than normal. The resulting erratic speed reading can be enough to trigger E162, even if the fan itself is in perfect condition.
- External draught interference Sometimes
Strong winds blowing directly across a poorly sited or damaged flue terminal can disturb the airflow balance, causing the fan speed sensor to report an out-of-range value and lock the boiler out.
- PCB (control board) fault Rare
If the PCB is failing, it may send incorrect voltage to the fan or misinterpret the speed feedback signal. This is comparatively rare but should be considered once the fan, wiring, and flue have been ruled out.
How to fix it
- Reset the boiler once or twice DIY safe
Press and hold the reset button (usually marked with a flame or 'R' symbol) for around 3 seconds, or switch the boiler off at the fused spur, wait 30 seconds, and switch it back on. If E162 clears and the boiler fires up normally, monitor it for recurrence. Do not attempt more than two or three resets — repeated lockouts on the same fault mean the underlying problem needs diagnosing.
- Check the flue terminal for obvious blockages DIY safe
From outside your home, visually inspect the flue outlet (the white plastic pipe exiting through the wall or roof). Look for bird nests, leaves, or debris covering the terminal grille. Do not attempt to dismantle any flue components — simply note what you can see and report it to the engineer. If a bird has nested inside, a Gas Safe engineer will need to safely clear it.
- Check for strong draughts near the flue terminal DIY safe
In very windy conditions, note whether the fault appears during or after periods of strong wind. If so, let your engineer know — they can assess whether a wind-deflector kit or a revised terminal position would resolve the issue.
- Do not attempt to access or repair the fan yourself Gas Safe engineer
The fan sits inside the boiler's sealed casing and is directly connected to the combustion and flue system. Opening the casing and working on the fan, its wiring, or the PCB is gas appliance work that must only be carried out by a Gas Safe registered engineer. Attempting it yourself is illegal for an unregistered person, could result in dangerous carbon monoxide exposure, and will likely void your boiler warranty.
- Call a Gas Safe registered engineer to diagnose and repair Gas Safe engineer
A qualified engineer will use a multimeter to test the fan motor windings, check the tachometer signal and wiring harness for continuity, inspect the flue internally and externally for blockages, and assess the PCB outputs. Depending on findings, they will clean or replace the fan, repair the wiring, or — if necessary — replace the PCB. Always ask for confirmation of their Gas Safe registration number before work begins.
Parts you may need
- Baxi flue fan assembly (replacement) · from £175
- Fan wiring harness · from £35
- Flue terminal anti-wind kit · from £25
- PCB (printed circuit board) · from £280
The exact spare depends on your boiler's GC number (on the data badge). Check this against the part before buying.
Typical repair cost
Expect to pay roughly £150–£400, depending on the underlying cause.
Frequently asked questions
Can I fix a Baxi E162 fault myself?
The basic checks — resetting the boiler and inspecting the outside of the flue terminal — are safe for a homeowner to do. However, any work on the fan itself, its wiring, or the PCB must be carried out by a Gas Safe registered engineer. The fan is part of the combustion and exhaust system; incorrect repairs could lead to carbon monoxide leaking into your home and would invalidate your boiler warranty.
How much does it cost to fix a Baxi E162 fault in the UK?
For most people the repair falls between £150 and £400 including parts and labour. A fan replacement on a Baxi boiler typically costs £250–£375 all-in, while a wiring harness repair is usually £100–£200. If the PCB turns out to be the root cause, parts alone can reach £250–£350, pushing the total higher — this is worth bearing in mind on older boilers where a new boiler may be more cost-effective.
Why does my Baxi keep showing E162 after a reset?
If E162 returns within a short time after resetting, the fault is persistent rather than a one-off glitch. The most common reasons are a fan motor that is beginning to fail (intermittent bearing wear), a loose wiring connection that vibration temporarily restores, or a flue blockage that hasn't been cleared. Repeated lockouts need an engineer's diagnosis — resetting the boiler repeatedly without fixing the root cause is not safe and will not resolve the problem.
Is E162 related to E160, E161, or E163 on Baxi boilers?
Yes — E160, E161, E162, and E163 are all members of Baxi's fan-fault family. E160 and E161 typically relate to the fan failing to reach the correct speed at start-up, E162 points to an incorrect running speed or a permanently blocked/seized fan rotor, and E163 usually indicates a fan overspeed condition. All four require a Gas Safe engineer to investigate the fan, its wiring, and the flue before the boiler can safely be returned to service.