Question about Honeywell Programmable Thermostat Heater
When hot water comes on first and heating second there is no power on the CH connection. When CH is on first and Hot water second there is power on HW Off, HW On and CH. This stops the Y plan 3 way valve from going to position AB
If this a honeywell valve you may need to change the motor in side the valve , sounds like its lost some of it power to move the inside of the valve to y postion .
Posted on Nov 04, 2012
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Posted on Jan 02, 2017
with y plan 3 connections on programmer HW on HW off CH on HW on to cylinder stat then HW call to Orange on Mvalve to power boiler and pump HW off to grey wire on Mvalve to close hot water CH to room stat common then heating call to white on Mvalve
Posted on Aug 17, 2009
Hi two things that go wrong inside the valve gets clogged up and blocks up in side, the valve in side and get worn sorry 3 things the motor on the top burns out , if you remove the top cover you will see a small motor with 2 orange wires on it you can remove the motor with 1 screw and see if its turning
Posted on Feb 08, 2010
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