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No heat in the zone when thermostat asks for it.. Zone gets heat only when other zone asks for heat. V8043F motorized heating zone valve operates once thermostat is asking for heat, but its end switch stays open. Therefore up until other zone valve turns the circulatur and furnace/boiler controller on they remain off. Thus no heat. Can I fix the end switch by checking the actuator function? Can I change just the switch? Should I change the entire valve head? Should I switch the valve head with other zone valve to see if problem follows? If the last two options are the only ways to get ahead, then how to change the valve head ?

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  • STARB Oct 15, 2010

    How do I get to it?

  • STARB Oct 15, 2010

    There is no information on how to change the faulty end switch, is it ?

  • STARB Oct 15, 2010

    18 years

  • STARB Oct 15, 2010

    Okay, is it sealed from the ball valve? I mean, can I do the head replacement w/o draining the water, refilling after, getting air out, etc.


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Hi. You might need to change the valves of your unit. here are few tips on how the valve looks like. i included also the manual for the your unit.

The first thing is the V8043 number. This number is the same for the straight through two way valve body configurations. The next letter for most heating system zone valves is the one that is confusing sometimes. Usually it will be an E or a F. There are other Letters but they are not nearly as common for home heating.

This is the E valve

No heat in the zone when thermostat asks for it.. - 2f56449.jpg
This is the F valve

The thing to remember here is that the E letter tells you that the zone valve has the 4 - 18" wires coming out of the motor. And the F letter tells you that the motor has the 5 terminal board on it. They can be interchanges but if you have one type already installed and you go to replace it you will have to do some figuring to know how to hookup the motor correctly. If you replace your valve with the same letter valve you will just be able to hook it up again as it was.

Then, as far as the last four numbers go, they just tell you what size pipe the valve is for.
If you need to replace the zone valve motor you can check the pricing for a replacement motor or complete head, but I have found that many times the best pricing will be to buy the whole valve and then just take the head off of the new valve and switch it with the old one.

You can look for the manual by clicking here. These link came from my fellow expert.

Have a good one!!

Posted on Oct 16, 2010

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How old is the model?

Posted on Oct 15, 2010

  • Sebin Punnacheril
    Sebin Punnacheril Oct 15, 2010

    I think you should replace the valve head. It will be available in the nearby Honeywell outlet.

  • Sebin Punnacheril
    Sebin Punnacheril Oct 16, 2010

    Generally the valve head is sealed to the valve. I'm not sure about your model. In most cases you should remove the entire valve and that makes you do all those things, and the most difficult one among those is pumping the air out.


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Replace just the end switch first.

Posted on Oct 14, 2010


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