3 port valve

Hi Following a faulty actuator on a Sunvic 3 port value SDMV2304, I was advised that a compatible replacement actuator is the Danfoss HSA3 (also backed up by http://www.seered.co.uk/sunvic_low_res_catalogue.pdf - see page 18). However the Danfoss HSA3 only seems moves the spindle through 90...

Hello everyone, Can someone please confirm if this (marked in red in both pictures) is the isolator valve? If so, will shutting this off will prevent water to flow to the 3 port valve connected below the pump (picture2)? We need to replace the 3 port valve body and need to know if we can do...

Hi, Brand new worcester bosch installed two days ago with hive controller. Turns on as per schedule in the morning but then does not turn off at all unless done manually using the boiler controls. Installer says hive is working fine as is the boiler and the fix requires a new 'suppressor'...

Hello All, I need a bit like guidance on how the nest should work on a Y-Plan setup. Had mine fitted by a certified nest installer. However for getting any real heating through the radiators I need to switch on the Water Heating as well, which is a bit strange. Also the rest position of the...

Hi, I've have a question that might help me clarify what the fudge is going on with my system, in particular a Honeywell 3PV: When I switch DHW off and turn the stat up for CH the 3PV motors open but the boiler isn't firing up. I've checked for 240v on terminal 7 from the orange wire and I...

Hi I have had a new boiler installed three months go, it s a Vaillant eco 418, separate water tank initially vented .Randomly massive gurgling sounds traveling through the system appeared . System was flushed, new pump, new 3 part valve and pressure relief valve. We changed pump, no change.Then...

First time poster long time lurker So recently I have noticed that when we have our programmer switched to do Hot Water only the radiators also get warm despite Central heating set to off and thermostat set to lowest. If we want central heating only or both HW/CH that also works ok. After some...

A week back our central heating wouldnt come on, with timer or switched to constant. The only way we could solve this problem was to run the central heating while the hot water was on and radiators worked fine. Through reading a lot of forums online and asking a plumber, we thought it would...