High
PUMP NOT RUNNING on Chaffoteaux Celtic 2 24 Rsc

Your boiler's water pump is failing to start, which means the system cannot circulate hot water to your radiators or taps.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description

ELECTRICITY NOT SWITCHED ON - FUSES BLOWN; MAIN SWITCH NOT TURNED ON; AUXILIARY CONTROLS INCORRECTLY WIRED - IF FITTED; PUMP JAMMED; BOTTOM MICROSWITCH NOT MAKING ABOVE DIVERTER VALVE

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

No hot water but heating works

Almost always a stuck diverter valve on combis.

Read →

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

Boiler won't turn on — 9-step checklist

Work through these before the call-out.

Read →