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Chamberlain Maintenance
Chamberlain Maintenance, Plumber
Category: UK Plumbing
Satisfied Customers: 331
Experience:  Qualified Plumber with over 17 years experience in Domestic & Commercial plumbing.
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I have a vaillant eco max 646 when the underfloor heating comes

Customer Question

I have a vaillant eco max 646 when the underfloor heating comes on the boiler comes to life then trips about 20 seconds later and the information displays code s54?
Submitted: 2 years ago.
Category: UK Plumbing
Customer: replied 2 years ago.
The water pressure on the boiler is 1.5 bar when off rises to 2 bar when it runs with hot water circuit on
Expert:  Chamberlain Maintenance replied 2 years ago.
This error can be a series of things, it is to do with the heat transfer meaning your boiler is heating up before reaching the room temperature and overheating. It will require a gas engineer to be called or maybe Vaillant. It could be the pump, heat exchanger, temperature sensors etc.