Howdo all!
Thanks for having a look and hopefully pointing me in the right direction.
Have the potterton performa 24, mechanical clock.
A few couple of weeks ago, the temperature control on the heating side stopped working, the rads were permanently at max temp and the boiler almost continually cycling on/off to maintain the temp. I assumed it would just be the temp sensor and an easy fix. So to counter this temporally, I set the clock to only operate the boiler in 15 min intervals on, 45 mins off.
This was working ok until late last week. After running the hot water, the heating side would kick straight in for a random time period, 30 seconds to a few minutes. This despite the timer being off and no heating required. Over a few days, the periods grew steadily longer to the point were it was heating permanently.
The heating will not shut off if the boiler switch is set to DHW only and the pump runs continuously, even when hot water is called for at the tap. The hot water still functions fine.
The reset on the switch also has no effect either. The only way to turn the heating off, is to have the boiler turned off. Luckily it's in the kitchen.
Having done some reading, I then suspected the microswitch. I'v had a mess about with it and it seems to be working fine. The diverter pin pops in and out normally and operates the switch, which doesn't seem to be sticking. I've given it a dose of WD40 and a good wiggle, but made absolutely no difference.
I've already ordered a new microswitch and temp sensor as they're only a few quid, but I don't expect them to arrive untill after the bank holiday weekend now.
Given the symptoms now, do you think it could be something else? I thought it could possibly be the PCB. Found a recon with 12 months warranty for £50 delivered.
At least for now, we still have heat and hot water!
Thanks in advance,
Gareth
Thanks for having a look and hopefully pointing me in the right direction.
Have the potterton performa 24, mechanical clock.
A few couple of weeks ago, the temperature control on the heating side stopped working, the rads were permanently at max temp and the boiler almost continually cycling on/off to maintain the temp. I assumed it would just be the temp sensor and an easy fix. So to counter this temporally, I set the clock to only operate the boiler in 15 min intervals on, 45 mins off.
This was working ok until late last week. After running the hot water, the heating side would kick straight in for a random time period, 30 seconds to a few minutes. This despite the timer being off and no heating required. Over a few days, the periods grew steadily longer to the point were it was heating permanently.
The heating will not shut off if the boiler switch is set to DHW only and the pump runs continuously, even when hot water is called for at the tap. The hot water still functions fine.
The reset on the switch also has no effect either. The only way to turn the heating off, is to have the boiler turned off. Luckily it's in the kitchen.
Having done some reading, I then suspected the microswitch. I'v had a mess about with it and it seems to be working fine. The diverter pin pops in and out normally and operates the switch, which doesn't seem to be sticking. I've given it a dose of WD40 and a good wiggle, but made absolutely no difference.
I've already ordered a new microswitch and temp sensor as they're only a few quid, but I don't expect them to arrive untill after the bank holiday weekend now.
Given the symptoms now, do you think it could be something else? I thought it could possibly be the PCB. Found a recon with 12 months warranty for £50 delivered.
At least for now, we still have heat and hot water!
Thanks in advance,
Gareth
