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The Honeywell zone valve end switch is a little button inside the zone valve that is pressed when the zone valve is fully open. When this button is pressed it sends a signal to the boilers control or a circulator control that tells the boiler there is a call for heat.
Note the lever under the power block. All Honeywell zone valves have this lever. It can be used to manually open a zone valve you just slide it over and hook it in to the little hook on the right. Even though this will allow water to flow through the zone valve, it will not depress the end switch button. the zone valve needs to be opened by power to open far enough to depress the end switch button
Now slide the lever on your zone valves, if the lever moves easy with out
much resistance the zone valves are open from the power source. This means
your thermostats are working and the transformer for the zone valves is also
working. Please note many times a separate 24 volt transformer is used for
the zone valve, and some times (if you have many zone valves) you will have
more then one transformer for the zone valves alone and a 24 volt
transformer for the boiler functions. Sometimes there is only one 24 volt
transformer that controls all of the boiler functions and opens all of the
If the zone valves are open check the red wires for loose connections. Please don't go switching wires around this will only make things worse. Gremlins do not come into your home and switch your wires around so if the boiler was working fine before you had this problem, the wires are in the right place don't switch them around.
If the lever is hard to move like you are pulling against springs your zone valves are not open please go to the transformer page.
Please use the Open Dialog Service.
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