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Discuss Duo-Tec hot water issues in the Gas Engineers Forum area at PlumbersForums.net

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Called to repair Baxi Duo-Tec Combi no hot water? Replaced plate heat exchanger blocked solid replaced change over cartridge and DHW sensor still the same issue Boiler comes on reaches 43-45* then shuts down then reignites and then same again? I took the inner door panel off while the hot tap was running the boiler fired up and stayed on the hot water reached temperature? When refitting the inner door the water temperature dropped back down to the 43-45* and kept recycling? Cleaned the Venturi the sensing tube checked the vertical flue for blockages it’s clear put everything back together still the same problem? Central heating working ok just issues with hot water. Just so stumped!!!!!!
Any advise welcome.
 
If it works with the inner door panel off, I’d be looking in that area, such as the air intake.
 

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