No heating or hot water. When I turn a hot tap on the boiler fires up and hot water is initially produced but within 10 to 20 seconds the water goes cold again. Went back to the boiler, it's just a tad under 1 bar (which is where it stayed), went back to the bathroom and basically the water kept alternating between warm & cold, not hot & cold but warm & cold. This issue can be caused by anything from faulty motorised valves, broken system diaphragms and airlocks, to low pressure or a broken thermostat. My Profile My ... On our worcester bosch unless I have it turned above 4 on the heat setting it can go cold when running a bath or go … And when this happens, cold water no longer gets pushed down to the bottom. A bit irritating when you're in the shower, as you might imagine. 3. Instead, it mixes with the hot water at the top of the tank. Which means, your hot water supply quickly turns lukewarm/cold. The water will be nice and hot, suddenly drop to ice cold and then eventually go back to hot. It may as well have been the cold tap. There are no hot and cold storage tanks or expansion tanks to worry about, so you can reclaim space in your attic or cupboard. Hi there We have a Worcester 281 RSF boiler, in a three bed semi in a hard water area. A couple of days ago I was running a bath and the water ran cold - if I turned the tap off then on again I would get hot water for a few seconds then it would go cold. How to check for a bad dip tube If you’re unsure whether or not a bad dip tube is your problem, check for these 2 bad dip tube signs: 1. • The cold water temperature sensor may not work be working properly. Hi,I had a new logic+combi24 boiler fitted early this year. Water mixed with cold water. I checked the boiler (Vaillant EcoTec approx 7 years old) and discovered the pressure had fallen to 0.5 bar. He's checked the pump and it's running ok. The heating is working perfectly but I am have no hot water. We have noticed this in the shower, bath and kitchen. He's replaced the wireing loom and fitted a new fan but the problem still exists. When I go to run the hot water, it heats up but when the boiler reaches max temperature it shuts off the flame and never kicks back on again so the water then goes cold. The heating function is working perfect, but I have trouble with the hot water system. Modern combi boilers are just perfect for not taking up a lot of space in the home, whilst giving you instant access to hot water and heating day or night – at a moment’s notice. Before the plumber came to fix the central heating leak, both the central heating and the direct hot water all worked okay. I've been having an issue with my hot water for a couple of weeks now- it comes out hot for about 2-3 mins and then goes cold for 2-3 mins, then goes hot for 2-3 mins, and so on. Combi Boiler won't maintain hot water temp. Naturally, it can be very frustrating when your boiler ceases to do the very thing it was designed to do – provide your home with heating and hot-water. The boiler is a Worcester-Bosch Greenstar 25si, if that's of any use. Only minor annoyance was that for the kitchen tap, the flow rate would drop off a lot as the water was heated up, and you'd have to … • Hot water temperature is low although hot water is recognized by the boiler. Lately we have found that the hot water will suddenly go cold. Only one hot tap in the house is giving hot water, the other ones at best is only tepid more often than not completely cold. Go back to the bath, stick my hand back under the water & it's cold. Low hot water temperature: Hot water setting error: Check the hot water temperature setting on the front panel. Worcester bolier - water goes cold.? Have no hot water is recognized by the boiler lately we have a Worcester 281 RSF boiler, a... He 's checked the boiler this in the shower, bath and.! 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