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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> Hot water too hot - what to check? https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1101677080 Message started by alansingfield on Nov 28^th, 2004, 9:24pm

Title: Hot water too hot - what to check?
Post by alansingfield on Nov 28^th, 2004, 9:24pm

I'm trying to find out why my hot water is always at 70 degrees whatever I set the cylinder thermostat to.

If I turn the stat up or down, I can hear the valve open and close. However, the pipe going through the HW cylinder is red hot, whether the valve is open or not.

My guess is a stuck valve, so is there any way I can get it back to life?

Title: Re: Hot water too hot - what to check?
Post by thescruff on Nov 28^th, 2004, 9:29pm

check the stat with a meter, switch it up and down to see if the power cuts off.

scruff

Title: Re: Hot water too hot - what to check?
Post by Stoday on Nov 29^th, 2004, 12:49am

Has it never worked properly? If so, it may be wired up incorrectly.

Otherwise, the actuator may have jammed or the actuator motor is burnt out. Try operating it manually. If that works, it�s probably a burnt out motor, which is normally easy to replace.

Download the data sheet from the manufacturers; that should help you to sort out what�s wrong and fix it.

Most actuators work by a motor turning the actuator on against a spring. When the motor is no longer energised, the spring turns the actuator off. Sunvic make a range that need a two way thermostat, one way to turn on and the other to turn off. These are expensive but the motor does not have to run to keep the valve open.