Medium
87 on Keston Heat 45

Your boiler is providing hot water to your taps as normal, but it is refusing to activate the central heating for your radiators.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

NO CH BUT DHW OK

From this model's manual
Verified against the Keston/Keston Heat 45 installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

81View →

All 36 fault codes on the Heat 45

Seeing a different code? Every code this model can display, in one place.

167475767879808182838485868990BCC FaultCylinder Thermistor FaultE18Error 20False Flame LockoutFan FaultFlame LossFlow Thermistor FaultFlow/Flue Thermistor FaultFlow/Return ReversedFlue Thermistor FaultIgnition LockoutL5Low Mains VoltageLow Water PressureOutside Sensor FaultOverheat LockoutPCB FaultReturn Thmr FaultToo Many Resets

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