The heating function is working perfect, but I have trouble with the hot water system. He's checked the pump and it's running ok. • The cold water temperature sensor may not work be working properly. Worcester bolier - water goes cold.? And when this happens, cold water no longer gets pushed down to the bottom. There are no hot and cold storage tanks or expansion tanks to worry about, so you can reclaim space in your attic or cupboard. We have noticed this in the shower, bath and kitchen. • Hot water temperature is low although hot water is recognized by the boiler. 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 water will be nice and hot, suddenly drop to ice cold and then eventually go back to hot. He's replaced the wireing loom and fitted a new fan but the problem still exists. 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. Water mixed with cold water. No heating or hot water. 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. The boiler is a Worcester-Bosch Greenstar 25si, if that's of any use. 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. It may as well have been the cold tap. The heating is working perfectly but I am have no hot water. 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. Hi,I had a new logic+combi24 boiler fitted early this year. Combi Boiler won't maintain hot water temp. Low hot water temperature: Hot water setting error: Check the hot water temperature setting on the front panel. Hi there We have a Worcester 281 RSF boiler, in a three bed semi in a hard water area. 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. 3. A bit irritating when you're in the shower, as you might imagine. 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 … 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. 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. Before the plumber came to fix the central heating leak, both the central heating and the direct hot water all worked okay. 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. I checked the boiler (Vaillant EcoTec approx 7 years old) and discovered the pressure had fallen to 0.5 bar. Lately we have found that the hot water will suddenly go cold. Instead, it mixes with the hot water at the top of the tank. This issue can be caused by anything from faulty motorised valves, broken system diaphragms and airlocks, to low pressure or a broken thermostat. Go back to the bath, stick my hand back under the water & it's cold. Which means, your hot water supply quickly turns lukewarm/cold. 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