S.34 Medium
Your boiler has paused because it detects a risk of its internal pipes freezing while trying to heat your home.
Technical description: Heating mode frost protection error
Typical repair cost: £0-120 (including labour)
DIY fix possible
Check that the room thermostat is turned up to call for heatEnsure any radiator valves in the room with the thermostat are fully openWait 15-30 minutes for the boiler to automatically clear the status once it detects a safe temperature riseGently increase the property temperature to thaw the surrounding air
Protect yourself from future repair bills
A boiler cover plan would cover faults like S.34 — no call-out fees, no surprises.
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Parts commonly replaced
- External NTC thermistor
- Flow/Return temperature sensor
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