Flow temperature low Medium
Your boiler is not reaching the required temperature to heat your home effectively, often because a setting is too low or the internal components are dirty.
Technical description: Boiler thermostat is set too lowBoiler thermostat faultyBoiler is underfiredCombustion setting of burner incorrectBoiler heat exchanger is sooted up
Typical repair cost: £100-280 (including labour)
DIY fix possible
Check the temperature control dial on the front of the boiler and ensure it is turned up to a high enough setting.Ensure there is enough oil in your storage tank.Reset the boiler by turning it off and on again to see if the fault clears.
Protect yourself from future repair bills
A boiler cover plan would cover faults like Flow temperature low — no call-out fees, no surprises.
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Parts commonly replaced
- Boiler control thermostat
- Burner nozzle
- Heat exchanger baffle
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