Boiler on constantly

greenbee

I thought my system was bad with 5 heating circuits and one hot water (I also have 4 electric towel rails managed through the same system)!

I previously had a problem with the ground floor rads coming on regularly throughout the day and night without the thermostat/programmer calling for heat - plumber said probably an electrical problem. The controller was wired completely wrong. Ground floor rads are behaving beautifully. Now the upstairs rads have an intermittent fault where they randomly come on without the thermostat calling for heat, and can't be turned off from the app or thermostat. Turning the circuit off at the controller just results in it kicking back in. And it definitely isn't any of the motorised valves as we've checked them all, and the frost stats, and turned off the 'failsafe' function that kicks in when the thermostat loses the connection to the controller.

Electricians have tried everything, so I'm now on the hunt for a plumber who can make sense of the plumbing, as I really can't work out what's going on. 

I swear if I ever move again, I'm going to build the place from the ground up and supervise every last bit of work so I know what is where and how it works!

ThisIsWeird

greenbee said:

I thought my system was bad with 5 heating circuits and one hot water (I also have 4 electric towel rails managed through the same system)!

I previously had a problem with the ground floor rads coming on regularly throughout the day and night without the thermostat/programmer calling for heat - plumber said probably an electrical problem. The controller was wired completely wrong. Ground floor rads are behaving beautifully. Now the upstairs rads have an intermittent fault where they randomly come on without the thermostat calling for heat, and can't be turned off from the app or thermostat. Turning the circuit off at the controller just results in it kicking back in. And it definitely isn't any of the motorised valves as we've checked them all, and the frost stats, and turned off the 'failsafe' function that kicks in when the thermostat loses the connection to the controller.

Electricians have tried everything, so I'm now on the hunt for a plumber who can make sense of the plumbing, as I really can't work out what's going on. 

I swear if I ever move again, I'm going to build the place from the ground up and supervise every last bit of work so I know what is where and how it works!

If the upstairs worked ok previously, then it's unlikely to be an incorrect wiring fault  - as with the ground floor - as wires don't tend to swap themselves.
It could possibly be a 'short' somewhere along a line, tho', if - say - you had meece chewing. But more likely it's an issue internal to the boiler, if you have truly discounted the valves as being the cause.