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Have just fitted a replacement Honeywell powerhead for Honeywell V4073A 3 -way valve at my daughter's house. On fitting the mechanism seemed to be jammed and the lever to lock in the mid-position appeared to have no effect and was free to move up and down. After fitting all seems to work correctly except the motor casing inside the powerhead is very hot to the touch, even when the system has been shut down for some time. I have similar system on my CH system and the motor casing is not hot at all when system is shut down. Do you think there is fault in powerhead?

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Posted on Jan 02, 2017

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SOURCE: Central haeting ok but no hot water

If the valve runs at other times, the valve is OK. you have a relay somewhere that is not sending signal to the valve when in that mode.

Trace down all the relays for that cycle and check voltage going int, coming out, and to see if the coil is enrgised.

Posted on Jan 01, 2009


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