Hi,
The pump on my system has recently started to keep running 24/7, regardless if there is any demand for CH or DHW.
Pump = Grundfos UPS2 15-50/60
MV = 2 x Honeywell Model ?
Boiler = Vaillant ecoTEC plus 428
Searching on the forum, suggests the MVs could be faulty - however, the pump is wired directly to the boiler itself - the MVs go to a Vaillant VR 65 Wiring Center - with a Vaillant VR 360F Wireless thermostat.
So I am not convinced that one of the two Honeywell MVs are at fault? (They have the little bump on the casing, so can be replaced without draining down - so that is one option I guess!)
Any ideas? Thanks in advance
The pump on my system has recently started to keep running 24/7, regardless if there is any demand for CH or DHW.
Pump = Grundfos UPS2 15-50/60
MV = 2 x Honeywell Model ?
Boiler = Vaillant ecoTEC plus 428
Searching on the forum, suggests the MVs could be faulty - however, the pump is wired directly to the boiler itself - the MVs go to a Vaillant VR 65 Wiring Center - with a Vaillant VR 360F Wireless thermostat.
So I am not convinced that one of the two Honeywell MVs are at fault? (They have the little bump on the casing, so can be replaced without draining down - so that is one option I guess!)
Any ideas? Thanks in advance