Keeps going hot and cold

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Keeps going hot and cold

Post  cperry on Fri Jun 02, 2017 4:22 am

Hi guys.

I've just moved into a house which has a Boilermate 2000 and a Gloworm boiler.

When you run the hot tap, the water keeps going hot then cold all the time. Flow is strong and consistent.

I've just searched on line and found two things to check, one is the filling tank placed on top of the cabinet, the other is the hot water pump on the right handside to the heat exchanger, is there anything else I could check?

Craig.

cperry

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Re: Keeps going hot and cold

Post  cperry on Fri Jun 02, 2017 2:01 pm

I'm fairly sure none of the three pumps are working.

Top cistern tank is ok.

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Re: Keeps going hot and cold

Post  cperry on Sun Jun 04, 2017 1:57 pm

Actually boiler pump is working, not sure about heating pump, heat exchanger pump intermitent while tap open.

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Re: Keeps going hot and cold

Post  scorp on Thu Jul 27, 2017 3:24 pm

If you are in hard water area then it could be PHE. It is not difficult to change it. You can buy it online for arounf £100, but before buying take it off and look inside, it will be obviouse if blocked with scale.
How to remove:
You don't need to drain whole system, may be around 20 liters. Isolate main water feed from filling expension tank. Close valve on top of HW pump. Connect pipe to outlet over that valve and open valve on outlet.
Ah, and isolate cold water. I usually do whole house and open some taps cold and hot.

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