Red steady on High
Your boiler has stopped working because it cannot detect a flame or is struggling to ignite the fuel properly.
Technical description: UV sensor defective or dirty oil valve defective fault – ignition transformer badly regulated burner, oil fuel not present
Typical repair cost: £120-280 (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 Red steady on — 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
- UV photocell sensor
- Oil pump solenoid valve
- Ignition transformer
- Oil nozzle
*Affiliate links — we may earn a commission at no extra cost to you.