U2453 High
The boiler's internal computer has encountered a communication error between its memory and control systems, which prevents it from running correctly.
Technical description: Fault U: Network CodeProblem is climate control system, lighting, airbags, etc..fault two; MFG – Manufacturer Specificfault four; Transmissionfault five; TP Sensor Learn Not Completefault three; Transmission Control Module Reprogrammable Memory
Typical repair cost: £250-550 (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 U2453 — no call-out fees, no surprises.
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Parts commonly replaced
- Main PCB (Printed Circuit Board)
- Control Module Unit
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