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I have a 15 year pld weill McClaine gas furnace. to one of…

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I have a 15 year...
I have a 15 year pld weill McClaine gas furnace. to one of the zones i have nest thermostat that has never functioned properly it has been calling for resets and saying it can't find power source intermittently. yesterdday it died and stayed dead. My furnace works but once it dlicks o the then shuts down, Now the house is cold, the in line water heater is not producing either.
i took the nest of the wall and the connection to the fires is now broken
I need toget the system to respong.
Submitted: 2 years ago.Category: HVAC
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Answered in 2 hours by:
3/7/2016
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,027
Experience: 40+ yrs. experience as a licensed oil & gas technician.
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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

What is the model number of your boiler? You can bypass the thermostat by connecting the 2 thermostat wires together

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Customer reply replied 2 years ago
i can't read it on the plate...but the thermostat is two wires white and red..i took the nest off and replaced it with a honeyewell two wire manual. I than switched the breaker from on to off and back on again. the furnace fired up but I don't know if it will stay on.
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

When there is a call for heat the burner will run up to the limit set point then shut off but the pump(s) will continue to run until the thermostat is satisfied. If the call for heat is long enough the burner will come back on when it drops below the differential setting on the control. If your boiler operates this way then it functioning normally.

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Customer reply replied 2 years ago
my in line hot water is still cold...the furnace was off all night...how do I call up for hot water? and does one thermostat zone that is not working shut off the entire system?
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

I don't know what you mean by an in line water heater. Do you mean you have a DHW coil in the boiler?

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Customer reply replied 2 years ago
no my mistake it is separate tank.
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Ok, it will take a while for the tank to heat up. 1 problem thermostat should not affect the other zones. So if you had no heat in all the zones you had/have a problem other than a thermostat problem. What is the brand an model number of the zone control with the lit LED's?

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Customer reply replied 2 years ago
zone control zvc 404 two out of 4 zones are lit...furnace shut off again...boiler model no is gv-5, water heater is gl 7natural gas system
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Just because the burner shut off doesn't mean the heat shut off (see my previous answer about system operation). If the boiler is near 180 degrees then shutting down is behaving normally.

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Customer reply replied 2 years ago
okshould i wait and see what happens?
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

You need to check the temp gauge on the boiler. Is it near 180?

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Customer reply replied 2 years ago
no it is below 70
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Ok what light is flashing on the boiler control (not the ZVC)?

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Customer reply replied 2 years ago
None that I see is it behind the panel?
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

You have to remove the front panel to the burner compartment

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HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Sorry, the top panel will give you a better look

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Customer reply replied 2 years ago
The circuit board that is to the left one flashing green labeled power and one flashing red labeled flare
Customer reply replied 2 years ago
There is one labeled pressure switch that is off entirely
Customer reply replied 2 years ago
The red is flashing is marked flame
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Ok, you need to have a pro check this out. The control is indicating a flame failure problem. This probably isn't something you can handle yourself unless you're comfortable working on a gas appliance. Let me know if you want to pursue troubleshooting this yourself.

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Customer reply replied 2 years ago
No I want to try it lets keep going
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Ok, turn the power off wait a minute then turn it back on again. Tell me what happens. Does the draft fan run? does the igniter glow? does the burner fire up then go out?

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Customer reply replied 2 years ago
The model is 101320 where are these components I just shut it down
Customer reply replied 2 years ago
It switched on then went off and back on I don't see an igniter
Customer reply replied 2 years ago
On and off and on again sounds like it's burning
Customer reply replied 2 years ago
Now power and flame lights are flashing and shut down
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Ok, this model, particularly as it ages, has a known issue with the burner cone. I suspect that's the problem if it fires up then goes out. Dealing with a burner issue is not a DIY project

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HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

I'd suggest you call in a pro who is familiar with this model. He'll have to pull the burner assembly apart and check it out.

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Customer reply replied 2 years ago
is this a big job? expensive?
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

It's a bit involved could easily run $4-500 hundred (maybe more) depending on what he finds.

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Customer reply replied 2 years ago
ok rick thanks
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

You're welcome

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