Hi, my central heating pump (Grundfos UPS 15-60) is giving me problems... - Initially it would simply not stop running when the heating was turned off. The boiler would stop but the pump would continue pumping cold water around. I had to manually switch the pump off at the electric supply. - Now if I leave the central heating on for more than an hour the pump will sometimes cut out. It feels quite hot but perhaps that is normal. Any ideas please?
If you can not hold your hand on the motor for a count of 10 when it has cut out, the motor has overheated and needs to be replaced or find some reason for an overload.
SOURCE: no hot water from combi boiler
i have a combie bolier when i turn the hot water taps on only cold water comes out central heating working fine can any one give some advise ?and can i fix it myself.
SOURCE: Vaillant boiler - heating OK, but no hot water.
Most likey problem is the diverter valve, not energising fully. This in turn will not move the little plastic lever arm that actuates the microswitch on the side, sending the signal to ignite.
You can buy a diaghram kit from most local plumb centres, you need to replace the diaghram and seals, don't forget the silicon grease to ensure the plunger doesnt stick. Kits less than a tenner.
You should have noticed before it stopped working completely the water had reduced in temperature before the weeks it failed.
To make sure it is a diverter valve fault, depress the microswitch if you can, when the hot water is flowing and hey presto the demand for hot water light should shine.
SOURCE: Grundfos UPS 25-50 180 - start up
Are you able to check for power to the pump with a mult-meter. If you have power you the know the pump has siezed (flat spot on the motor) if there is no power then you know there are issues with the controls.
I hope this may have helped,
Tom
SOURCE: Voltage at pump is 120 & air pressure in tank
it sounds like the pressure sensor or switch is bad.
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