Here's my problem, I started a 5 minute job on sunday to replace a room stat with a cracked dial - now i've got no heating and have run out of ideas.
I replaced a Honeywell T630B room stat with a Sunvic TLX 4101, and managed to blow the fuse in the circuit isolator twice in the process before getting it to work. Everything seemed fine but when the heating came on none of the radiators heated up. I subsequently put the old room stat back on to fix it - this didn't work.
I thought initially it was the pump as the water was heating up, no1 radiator on the loop was getting warm but nothing else. The boiler also seemed to cut out after about 10 mins of use.
Last night I found it wasn't the pump after using the manual override on my three port valve (Honeywell V4073A) and getting heat to all the radiators. Putting it back to auto gives me no heat again
I've tested the contacts on the three port valve with a multimeter and have 240V between orange and white and 105 between orange and grey when heating and water are on?? The 105 disappears when I turn the water off. The room stat appears to have no effect on the boiler firing whatsoever.
I can't figure out what i've broken, whether it's the three port valve, the room stat or the control box (Centaurplus C27).
Can anyone give me any ideas on isolating the problem please - my money's on the valve head but i'm not sure?
Many thanks...
I replaced a Honeywell T630B room stat with a Sunvic TLX 4101, and managed to blow the fuse in the circuit isolator twice in the process before getting it to work. Everything seemed fine but when the heating came on none of the radiators heated up. I subsequently put the old room stat back on to fix it - this didn't work.
I thought initially it was the pump as the water was heating up, no1 radiator on the loop was getting warm but nothing else. The boiler also seemed to cut out after about 10 mins of use.
Last night I found it wasn't the pump after using the manual override on my three port valve (Honeywell V4073A) and getting heat to all the radiators. Putting it back to auto gives me no heat again
I've tested the contacts on the three port valve with a multimeter and have 240V between orange and white and 105 between orange and grey when heating and water are on?? The 105 disappears when I turn the water off. The room stat appears to have no effect on the boiler firing whatsoever.
I can't figure out what i've broken, whether it's the three port valve, the room stat or the control box (Centaurplus C27).
Can anyone give me any ideas on isolating the problem please - my money's on the valve head but i'm not sure?
Many thanks...