U2-01 Low
Your boiler has detected that the electrical supply coming into the unit is currently too high, which could cause damage to internal parts if left unchecked.
Technical description: Supply voltage is above high limit, your boiler should continue to operate but you need to Contact a heating engineer
Typical repair cost: £80-250 (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 U2-01 — no call-out fees, no surprises.
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Parts commonly replaced
- PCB (Main Controller)
- Voltage Regulator
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