Hoping that someone can offer some advice.
Y-plan system. During summer months, HW as normal, heating still running timed program but room stat turned right down.
On Sunday, turned room stat up (it was a bit chilly), all operated fine.
Until Tuesday, boiler stayed on constantly regardless of stats, after a few hours the house became like a sauna & the HW scolding.
Power cycled boiler on front panel - fired straight back up.
Power cycled complete system at FCU - has now been working OK.
I am concerned this may happen again & boil/collapse the CWST - not good.
Does this sound like an issue with the programmer or 3 port valve?
TIA
Y-plan system. During summer months, HW as normal, heating still running timed program but room stat turned right down.
On Sunday, turned room stat up (it was a bit chilly), all operated fine.
Until Tuesday, boiler stayed on constantly regardless of stats, after a few hours the house became like a sauna & the HW scolding.
Power cycled boiler on front panel - fired straight back up.
Power cycled complete system at FCU - has now been working OK.
I am concerned this may happen again & boil/collapse the CWST - not good.
Does this sound like an issue with the programmer or 3 port valve?
TIA