5 Red Flashes High
Your boiler's internal memory chip has developed a software or connection error, meaning it can no longer remember its correct settings to operate.
Technical description: Parameter storage unit (PSU) error
Typical repair cost: £120-350 (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) chip
- Printed Circuit Board (PCB)
*Affiliate links — we may earn a commission at no extra cost to you.