Baxi Solo boiler no heating.

3 Dec 2007
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United Kingdom
Hi, the father in law has a dilemma. Ha has a baxi solo boiler, Honeywell st9400c stat and a Honeywell unit next to the tank.
The problem is that if they try to put the heating on with the hot water the the timer flashes from heating to water and shuts the boiler down. They can have hot water but no's about 2.5 years old, fitted as part of government scheme.......any ideas please before he calls out an engineer?

Do I need to post more information?
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