Heating Won’t Come on Without hot Water on Worcester Boiler


Postby LindaDIY » Sat Nov 25, 2017 4:08 pm

I have a greenstar Worcester gas fired condensing boiler, 7 Year’s old, regularly serviced. It has a Honeywell thermostat with a Salus digital room thermostat.
I generally have the hot water on for a short period am and pm and leave the heating on constant, using the room thermostat to control when it comes on. All working normally until a couple of weeks ago when heating did not come on even though thermostat was set to 16 and showing room temperature of 12. The led display on remote thermostat was showing it was sending a signal and the receiver light was green. The boiler would fire and then just die down again the next second. I then put the hot water on constant and the heating then came on. The next day I planned to call a plumber but the system rectified itself.
Two weeks of normal working, now it’s getting cold and it’s gone temperamental again! I had the boiler serviced during that 2 week period, mentioned the earlier problem but the guy said as it was working normally when he saw it he couldn’t trace a fault.
Any ideas?
LindaDIY
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