BoilerFaultCodesWhat the manual says
Manufacturer manualPump/fan overrun.
From this model's manual
Verified against the Glow Worm/Glow Worm Energy 35 Store Installation And Maintenance Instruc installation & service manual.
DIY fix possible
Check that at least one radiator is turned on fully (TRV set to max) to allow heat dissipationEnsure the system pressure is between 1.0 and 1.5 barWait up to 10 minutes for the boiler to complete its natural cooling cycleBleed radiators to ensure there is no trapped air affecting circulation
Find a Gas Safe engineer
Search the official register →
Boiler cover options
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.
Related fault codes
All 72 fault codes on the Energy 35 Store
Seeing a different code? Every code this model can display, in one place.