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We have a flat in a development with a central boiler. The flat has a heat exchanger and a local tank and underfloor heating. There are two HPA2 valves - one for the heating one for the water.
Theres an annual check of the heat exchanger part (which is covered by the service charge) and this year the engineer recommended one of the HPA2 valve heads was replaced.
However, I've tested the system and can't work out what they think the problem is -
Testing done -
Hot water - turned up thermostat on tank. Call for heat, valve opens/pump starts. Turn down stat, call for heat ends, valve closes and everything stops.
Heating - tested room by room using wall stats. Each zone triggers the heating, opens UFH valve, starts pump and HPA valve activates and water flows.
Since everything seems to be working mechanically I’m not clear why a valve head replacement has been suggested - is there some other part of the valve head that may not be functioning correctly?
Maybe its slow
Maybe it makes a funny noise
Maybe it is cycling between open and closed (mine did that), which still sort of looks like working if you just check the rad is hot
sounds fine. seems to work.
Got the engineers report and it said "Carried out service to the hiu and found it needs a new hpa2 head for the hot water as constantly running .’"
its clearly not doing that now so just need to keep an eye on it and see if it becomes unreliable I guess.