It's my main goto programer I've never had any problems a bit concerned that I fit a different make and the same thing happens again I've left it out of circuit at the mo the customer can use the room stat to regulate heating and the water is temporarily controlled by tank stat, if I don't find...
Sorry fella just wanted to register and start question, it's an st9400c the first one lasted about 2 weeks, and this one has again lasted 2 weeks. before the first one froze the screen went back to the default date 1/1/2019 and the time was 12:10am both heating and hot water on auto but no...
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