S.2 High
Your boiler has sensed that water isn't moving through the unit as quickly as it should be, causing it to stop heating to prevent overheating.
Technical description: Pump flow error
Typical repair cost: £180-450 (including labour)
DIY fix possible
Ensure all radiator valves and isolation valves are fully openCheck that your system water pressure is between 1.0 and 1.5 bar on the displayBleed your radiators to remove any trapped air pockets
Protect yourself from future repair bills
A boiler cover plan would cover faults like S.2 — 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
- Pump head
- External pump (if used in commercial S-plan)
*Affiliate links — we may earn a commission at no extra cost to you.