5 red flashes High
Your boiler's internal memory chip has developed a communication fault, meaning the control board can no longer read its essential settings.
Technical description: Parameter storage unit (PSU) error.
Typical repair cost: £120-250 (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 5 red flashes — 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
- Parameter Storage Unit (PSU)
- Printed Circuit Board (PCB)
*Affiliate links — we may earn a commission at no extra cost to you.