hot water problems

[P.STEBBINGS]

hi ive just recently moved into a fairly new house built in 2006, ive got two types of boilers an ideal icos downstairs and a boiler mate ov upstairs, problem is everything in the house works fine with the hot water apart from when i run the bath the hot water only stays hot for a few seconds and just then cools down, if i turn the tap off and back on again the same problem occurs ending up with a luke warm bath, also have a en-suite with a shower but thats fine, the central heatings fine and all the sinks are fine its just the bath, can anyone help?

[Steviegb]

Have you got a mixer tap fitted to your bath? If so this could be mixing cold water with your hot if it is faulty. Boiler must be working ok as you have no problem with your other taps.

[P.STEBBINGS]

no two seperate taps, totally confusing!!!

[Steviegb]

Best bet is to trace hot water pipe from bath back to boiler mate or as far as u can just to make sure no ones been messing with it, suggest u get a decent plumber.

[gucciman]

im trying to rememeber if ive come across this problem before or not, we had a similar complaint last yr and it was caused by an automatic mixer valve at the hot water cylinder which was letting only the cold through. this was a mains pressure hot water system though.

[gasman]

For the best hot water results turn you're Ideal iCOS boiler thermostat to max and always leave it set to maximum. Do not worry about the heating you can control this with you're wall room thermostat and timer. On the boilermate set the rocker switch for the central heating to timed, and the hot water rocker switch to constant and leave them at that. After about 20 mins you should now have a full store of piping hot water. If you are still not getting the results you want after setting the controls as described above then open the bath hot water tap at approximately 6 litres/minute. After about 2 � 3 seconds, check that the plate heat exchanger pump has kicked in. This is indicated on the A.C.B. by display segment H2.1. and the pump is the one on the middle right hand side, above the heat exchanger in the boilermate. if it is not showing on the A.C.B. display or you can not hear or feel it working then you check there is power to it if there is then you need a new domestic hot water pump. But these are the four wired pumps not the standard three so make sure you get like for like. If the pump is running then you need to check for correct opperation and if nesessary replace the Middle store sensor, the Bottom store sensor, the Domestic Hot Water OUT sensor, the Cold Water IN sensor and both of the Store overheat sensors. If they check out fine then test the mixer valve and finaly test the P.C.B and replace that if nessessary.