Low
265 on Worcester Bosch Heatslave

Your boiler is temporarily reducing its power because it is producing heat faster than your home can take it away.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description

The boiler is waiting in response to a heat demand – the boiler regularly switches to partial load

DIY fix possible

Check that all radiator valves are fully open to allow heat flowBleed all radiators to remove trapped air from the systemMonitor the boiler for a set period to see if it clears once the house warms upCheck the system pressure gauge and top up if it is below 1 bar

Find a Gas Safe engineer
Search the official register →

Related fault codes

201View →204View →

Related guides you might find useful

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

Radiators cold at the bottom

Sludge build-up — needs flushing, not bleeding.

Read →

Boiler won't turn on — 9-step checklist

Work through these before the call-out.

Read →