Hi, we’ve got the vaillant ecoFit Sustain. Flow temp is set at 65. CH is calling for heat as per the NEST thermostat, but boiler gets to 41 and then starts to cycle and temp cools down. Rads only getting lukewarm. We did have the sensocomfort thermostat with the weather compensator probe (probe still connected to boiler). Not sure if it’s the weather compensator or something else that’s causing boiler to constantly cycle and rads not heating up properly. Any ideas/help?
Lukewarm rads and constantly cycling boiler
- Thread starter Danlen
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So did it work before this thermostat was removed ?
Perhaps whoever removed it did not restore the circuit as it was before.
Yeah everything worked fine beforehand. 3 houses on estate had NEST fitted on same day, 2 of us still have weather compensator connected and are having exactly the same issue, the 1 that doesn’t have the compensator theirs is working fine, so hoping it’s the obvious cause.
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You would be better off with the weather comp rather than nest
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