WB Greenstar 30i erp

[stevejd58]

Over the last few days I have intermittently had a lack of heating on the timer, I can get the heating on by pressing reset but not by changing the mode from timer to always on.
I'm wondering if the room thermostat has given up the ghost, a BG RS2 of indeterminate age maybe the boiler isn't being told to come on.
Hot water is fine in eco mode and comes on as expected.

I will check the connections behind the thermostat and the boilers junction box just to be sure nothing has come astray. With the thermostat, is there a way of testing functionality with a multi meter? this is how mine is wired

 

[CountryFan]

All you would be checking for on the room thermostat is the switched live for voltage. Sounds like it could be the timer at fault or a motorised valve if you have one?

 

[Harry Bloomfield]

I will check the connections behind the thermostat and the boilers junction box just to be sure nothing has come astray. With the thermostat, is there a way of testing functionality with a multi meter? this is how mine is wired

When testing something which is so intermittent, rather than testing with a meter, it is often better to connect a small wattage lamp to the circuit, then you get an obvious indication when the circuit is on.

Just a lamp holder, bit of flex, and a 15w lamp or similar. You connect, and leave it connected.