WHEN MY C/HEATING SYSTEM IS SWITCHED ON TO HOT WATER ONLY IT ALSO
NOW HEATS THE RADS ONLY. The unit called a duoval also makes clicking noise which means I suppose its sticking and not shutting off the rads when not wanted. How easy is it to replace the DUOVAL if thats what is needed,
Can anyone help please?
NOW HEATS THE RADS ONLY. The unit called a duoval also makes clicking noise which means I suppose its sticking and not shutting off the rads when not wanted. How easy is it to replace the DUOVAL if thats what is needed,
Can anyone help please?