Today I have had a problem with the domestice hot water, in that it is not getting very hot, only warm.
A few weeks ago when I had the plumber in for another job and he mentioned to me that the 3 port diverter valve appeared to to stuck in position and nothing happened when the arm was moved to the manual position.
However, as I was getting both hot water and central heating, this was not an immediate problem for the moment. If the valve was already faulty and stuck in the mid position (as I had both heating & hot water), I can't see why it would suddenly stop giving hot water.
The system is about 18 years old and the diverter valve is a Honeywell Sundial 3 port diverter, I think it is Y Plan configuration.
I don't know if the valve is faulty, or the actuator, does anyone know how to test this? Also, if the actuator is gone, can this be replaced without draining down the complete system and removing the valve body?
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