Hi, I just moved in a new place. The water heater is Worcester Greenstar and it's been giving me problems. If I am taking a shower, after 2-3 min the hot water will completely stop, ice cold water for 1-2 minutes, then the hot water comes back on at some point.
An engineer came, he just turned on the hot water, the temperature didn't drop for 5 min and he deemed that the shower head is faulty (like for real???) and that was that.
Another thing I noticed today is that to "restart" the hot water quicker, I can stop the cold water completely, open the hot water on max and it comes back in <30 seconds. And aparently if I don't turn on cold water at all, the hot water doesn't stop.
In addition it seems that the boiler is losing pressure quite fast - in 1d it lost almost half a bar.
Anyone have any ideas what could be the issue?
Are you a tradesperson and able to answer this question?
If it’s only at the shower it’s probably a faulty shower. If it’s at tap outlets it is low water pressure and your boiler is over heating. If this is the case you may need to also re charge your expansion vessel or you may have a leak somewhere hence why you are losing pressure. Other then that it could be a blocked plate heat exchanger.
If it is only a fault when the shower is running it is most likely a faulty shower cartridge ,
If the fault happens similarly with hot water tap outlets then most likely blocked plate heat exchanger on the boiler.
This would require remedial work carried out by a gas safe registered engineer
Answered3 August 2022
0
Anonymous user
Possibly faulty thermistor , pressure dropping check where blowvoff pipe terminates outside normally and see if it's dropping when heating on also pressure when heating on if it goes to 3bar quite quickly safety valve will open to release pressure then when systems cold pressure will be low
Answered9 August 2022
0
Anonymous user
If you have Hot water to cold from a Combi boiler it will be one of 2 things , noting to to do with mains pressure as the other person answered , if this is only happening at the mixer shower ams no where else it will be the shower mixer itself , if this is happening at all the hot outlets it’s more then likely the plate heat exchanger within the boiler, absolutely nothing to do with water pressure
