Glow worm ultracom 30cxi CH ok, HW runs cold after 1 min

[pikeo]

This boiler was installed 2.5 years ago, and for the most part has been fine (except for the crazy room stat that even the glowworm engineer couldnt program).

The problem we are just having is that the hot water stops after about a minute and runs cold, not getting hot again. This is particularly noticeable in the shower and bath. This was fine before. This does not happen with the kitchen tap.

When I run the kitchen tap, i get 5 "flames" in the display panel and the tap runs hot, when I run the bath or shower I get only 1.

Any clues? thanks

 

[leadlotus]

Sounds like the Flow Sensor,( To check the wires at the pcb(J7) should be reading- Pink 5 volts dc - White 18 volts dc - Grey 0 with the tap running)
If all else fails phone the tech line (number on the back of the boiler manual)

 

[Agile]

I would almost wonder if there is a cross over between cold and hot in the bathroom area.

Do you have joystick taps? Does it make any difference setting them all to the cold position ( even when off ) ?

What happens if you put the downstairs AND upstairs hot taps on at half flow each?

Tony

 

[mickyg]

its not the flow sensor if the boiler is still running. As tony says, it sounds like something backfeeding. When you run the bathroom tap feel the pipe 2nd in from the left under the boiler to see if its hot. If it is its probably your taps, or a shower or similar causing the problem.

 

[pikeo]

Well, the thing is that it has been working fine for 2.5 years.

The Shower is on one bathroom, the bath in another, both worked a few days ago, both now run cold after about 1 minute. I've hadno plumbing work done or any changes. Could this still be a problem with taps as its in two different unrelated places at the same time?

The only thing I have notcied is that the mains pressure has increaed the last few weeks.

Does this narrow it down at all?

thanks for all the help btw

 

[mickyg]

When you run the bathroom tap feel the pipe 2nd in from the left under the boiler to see if its hot.