Search the forum,

Discuss Hot water coming on combi sometimes other times not in the UK Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Messages
67
Hi guys thankfully not been needing to com on for a while but could do with a pointer.

2 weeks ago I noticed boiler didn’t fire for hot water in kitchen which is next to boiler and cold main in, it came on after a few seconds longer than norm I thought just a blip, but this weekend and since it’s been bad I’m 4 in a block terrace, second from main inlet my mums next door, noticed Sunday as always has happened flow reducing but still strong a good 800ml in 6 seconds but wouldn’t fire up she had her washing machine n tap on put tap off hot water went, she has lower flow than me and same boiler Ariston class HE 30 and gets hot water no bother as did I till Sunday, Scottish water came out just under 2bar into house, with no other taps on, if I run my tap with no others on it’s over a ltr in 6 seconds

Anyway now most days my bathroom sink won’t fire up again a ltr 6 seconds but if I turn on the bath tap it fires up n then open the sink tap close the bath tap n all good. If I flush the loo even the downstairs sink hot won’t come on, yet if the hot waters running on I can turn all taps on to hot or the rest to cold n one hot and boiler maintains hot water.

My mates a plumber/heating engineer not been over yet but suggested it might be the water flow sensors playing up n maybe restricting a bit more flow/blocked. The flow I don’t thinks changed any time n honestly my mums on 400/500 ml per 6 seconds n works ok even with other taps on. The Scottish water guy suggested even flushing the loo shouldn’t stop the kitchen hot coming on as it’s the first demand from the cold main n even said the flow rates fine.

Heating working fine!

Attachments the kitchen sink flow at hot when running bath cold n won’t fire, the others are bathroom sink won’t fire that’s with no other water on n the bath one running hot at that flow rate, any help or advise would be great. My mates going to get the new flow switch anyway but I guess I’m asking could it be that, that is causing the issue like I say it happened couple weeks ago but hot water at bath sink was fine as shaved plenty times now hardly comes on hot.
 

Attachments

  • IMG_1120.MOV
    1.7 MB
  • IMG_1121.MOV
    1.2 MB
  • IMG_1122.MOV
    2.3 MB

Reply to Hot water coming on combi sometimes other times not in the UK Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Similar plumbing topics

I recently had an eco tec plus 836 combi installed as part of an oil to gas conversion. One thing I can’t work out is why the bathroom sink hot water flow is 12-13L per minute with at 44c and even hotter. However the nearby bath freestanding tap is 8-9L per minute at this temp. Both taps...
Replies
1
Views
191
Looking for any ideas to help. I've a Heatrae Sadia Hot Water tank, heated through Oil fired boiler (working fine). A week ago I reset the air gap as I was having dripping from the pressure relief valve. Since then I've lost a lot of pressure from the hot water feed to my shower. The rest of...
Replies
8
Views
272
I recently installed new hot and cold feeds to a new downstairs cloakroom. After refilling the system the hot taps were all dribbling, spluttering and showing signs of an air lock. I attached cold mains to a hot tap and left it running for 15 minutes, while opening up each hot tap. They all...
Replies
2
Views
511
Hi, I hope someone can help. I’m hoping this isn’t a permanent problem. We’ve converted a gravity vented hot water system, into an unvented indirect hot water system to improve pressure in the house. The previous cylinders are in the loft now they’re in the garage next to the boiler. We...
Replies
18
Views
982
Afternoon. I have an issue with no water flow from any of the hot taps in the house, I can't seem to find a solution to the issue. System is a megaflo unvented indirect cylinder (125i) boiler is a Worcester greenstar. I have good pressure on the cold feed and all the usual stuff works, taps...
Replies
11
Views
295
Creating content since 2001. Untold Media.

Newest Plumbing Threads

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock