Friday 14 December 2012

Hot Water Not Getting Hot, Heating Getting Too Hot

I was asked to look at a heating system because the lady was not getting any hot water when the boiler was on, and the only way she could get the hot water to heat was to put the immersion heater on. Also, she had also been struggling to control the temperature of her radiators. Even with the room thermostat turned down low the radiators were still heating up.

Looking in her airing cupboard there was a Honeywell V4073 three-port valve. The hot water was set to be on and the room thermostat was turned down low. Feeling the flow and return to the cylinder both pipes were only slightly warm. Feeling the lever on the valve head it was loose, and moved easily from side to side with no resistance. This indicates that the valve was open for the heating. 

After removing the casing from the valve I attempted to move the mechanism back to the hot water position manually. I was unable to do so and so removed the head from the valve body. As soon as I removed the valve head it sprung back to the hot water position. I felt the spindle on the valve body and that appeared to be moving with little resistance.

I replaced the motorised valve head with a new one and tested it's operation. The valve was operating correctly and heating was restored to the hot water cylinder.

15 comments:

  1. I've had both problems but i was more baffled by the heating being on full wack even though the thermostat was on low. I usually can do some diy but i had to get a chap in for this and turns out the pins on the thermostat where stuck and it was either on at full or not.

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  3. Hello,

    Excellent post! It is very useful about DIY fixing the problem.
    For myself I prefer to call a technician to remove any issues about the central heating. Thank you for the thread!

    Kindest regards,

    George

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