116 High
Your boiler has detected that the floor thermostat or external safety circuit has been triggered, often to protect your underfloor heating system from overheating.
Technical description: All Combi and System Boilers
Typical repair cost: £90-180 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 116 — 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
- External limit thermostat
- Wiring harness
- Control board
*Affiliate links — we may earn a commission at no extra cost to you.