41E High
Your boiler has detected that the water isn't moving through the system correctly, causing a large temperature gap between the pipes.
Technical description: Different temperature between flow and return
Typical repair cost: £120-280 (including labour)
DIY fix possible
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 barBleed all radiators to remove trapped air bubbles
Protect yourself from future repair bills
A boiler cover plan would cover faults like 41E — no call-out fees, no surprises.
*Affiliate links — we may earn a commission at no extra cost to you. Prices shown are starting prices.
Parts commonly replaced
- Circulation pump
- Flow/Return thermistors
- Main heat exchanger (de-scaling)
*Affiliate links — we may earn a commission at no extra cost to you.