BoilerFaultCodesYour boiler has detected an issue with how it clears exhaust gases or brings in fresh air, preventing it from firing up for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Air pressure switch error
What causes this fault?
This fault occurs when the boiler's internal safety sensor detects that the fan isn't moving air through the system correctly, which is vital for clearing dangerous exhaust gases. The most common reasons are a blockage in the flue pipe, a split in the small rubber sensing tubes, or a mechanical failure within the air pressure switch itself.
This fault can be more frequent during periods of heavy rain or high winds, as debris can be blown into the flue or moisture can enter the sensing tubes.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like 162 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
Affiliate links — we may earn a commission at no extra cost to you.