Boiler running 24/7 - heating programme panel issue?

Diy.2020

Hello I have a grant vortex condenser boiler, connected to radiators (up, down) and hot water cylinder and a eph t37 heating control panel for the 3 zones.

At the moment the heating control panel is turned to off for all zones, but the boiler is still firing up and the hot water cylinder is constantly hot, as is the heated towel rail in bathroom.

I’m trying to figure out where the issue is? Boiler was serviced and is fine including boiler thermostat. So options are an issue with the timer panel? Or an issue with the cylinder thermostat? Or something else entirely?

Thoughts would be welcome as new to this and not sure which bit to try fix first.

Wearb

Most likely a stuck motorized valve.

Diy.2020

Wearb wrote: »

Most likely a stuck motorized valve.

Thanks very much will have a look and hope to get sorted thanks

Dtp1979

Diy.2020 wrote: »

Thanks very much will have a look and hope to get sorted thanks

Or the service guy turned on the service switch on the boiler and forgot to turn it off

Wearb

Dtp1979 wrote: »

Or the service guy turned on the service switch on the boiler and forgot to turn it off

If that was the case, should the cylinder be getting hot?

jimf

if not a motorised vale and you have an outdoor boiler possibly but not very likely a faulty frost stat

Wearb

jimf wrote: »

if not a motorised vale and you have an outdoor boiler possibly but not very likely a faulty frost stat

Again the same question as above. Will the call from frost stat heat cylinder?

jimf

Wearb wrote: »

Again the same question as above. Will the call from frost stat heat cylinder?

you would imagine it shouldn't but wiring issues have cropped up here before

with the one rad heating it sounds like a heat dump or maybe a bypass

but with the cylinder getting hot all the time it does sound like a sticking micro switch on that motorised valve

Wearb

jimf wrote: »

you would imagine it shouldn't but wiring issues have cropped up here before

with the one rad heating it sounds like a heat dump or maybe a bypass

BAD WIRING?
Never! <Grin>.

jimf

Wearb wrote: »

BAD WIRING?
Never! <Grin>.

:pac::pac::pac::pac::pac::pac::pac::pac::pac::pac::pac::pac::pac::pac:

Dtp1979

Chances are it’s a MV stuck.