BoilerFaultCodesYour boiler's computer brain is momentarily confused by some internal settings and cannot operate correctly.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Temporary error- parameter fault. Incorrect parameters.
What causes this fault?
This fault occurs when the boiler's main control board loses its specific configuration settings or detects a mismatch in its internal programming memory. It is often triggered by a sudden electrical surge, a failing memory chip, or a breakdown in the communication between the boiler's internal components. Because the boiler no longer knows its own operating limits or model type, it shuts down as a safety precaution.
DIY fix possible
Locate the selector knob on the front of the boiler control panel.Turn the knob to the 'Reset' position and hold it for five seconds.Return the knob to your desired setting and wait for the boiler to restart.
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 H.02 – .04 — no call-out fees, no surprises.
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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.
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