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Rick Ridley
Rick Ridley, UK Heating Engineer
Category: HVAC
Satisfied Customers: 2708
Experience:  Retired But have had 30 years on the tools, Ex CORGI
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about the mid-position diverter valve, the central heating

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about the mid-position diverter valve, the central heating doesn't work when the lever is switched to "auto", but the hot water is working, and while the hot water is on, then heating is on too, even the heating timer is switched off.
Hi Rick here UK plumber, if you turn the power off and try the lever do you get resistance on pushing it to Manual, and does it return on the spring, I suspect the spindle is seized, Rick
Customer: replied 6 years ago.

thanks for the answer, but does it mean i have to change the power head or the valve or both?


that depends on what you find when you remove the head, this is held by two brass cross head screws accessible after removing the metal cover, lock the lever into Man first, once removed if the spindle is tight (you should be able to move it with your fingers) spray it with WD 40 and use a tool to gently turn it back and forth (it only goes through less than 90 degrees) if it fees off without leaking pop the head back on and test, if the spindle was free then the problem will be the gears in the head, simple replacement, Rick
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