How to Replace the Pcb Display on a Baxi Duo-tec 40 GA (UK)
Step-by-step UK guide to replacing the user interface / display board on a Baxi Duo-tec 40 GA. Part numbers, torques, commissioning.
Baxi
The part
Fit a new fascia display on Baxi Duo-tec 40 GA when the screen is blank, dim or the touch buttons no longer respond.
Isolate safely
The display board is separate from the main PCB on Baxi Duo-tec 40 GA. It plugs in via a 6-way ribbon or JST connector.
Fit and commission
Handle by the edges — ESD damages the driver IC before you even fit it.
Recommission checklist
Refill the Baxi Duo-tec 40 GA to 1.2 bar cold. Bleed high-point radiators and the internal AAV.
Run a full flue-gas analysis after 15 minutes. Log the reading against the OEM commissioning envelope in the Benchmark book.
Frequently asked questions
- Do I re-enter installer settings?
- Yes — the display holds the language and clock; installer parameters live on the main PCB and persist.
- Is a firmware update needed?
- Only if the OEM display carries a newer part suffix (e.g. -02). Older firmware can throw comms faults with newer main PCBs.
- Do I need to notify the manufacturer?
- Only if the Baxi Duo-tec 40 GA is in warranty — Baxi require log of any part swap for labour claims.
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