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Thank you, the unit will not fire, yet the the pilot is on

Customer Question
Customer: thank you, ***** *****...
Customer: thank you, ***** ***** will not fire, yet the the pilot is on and the pump. My name is ***** *****
JA: Thanks. Can you give me any more details about your issue?
Customer: This system has 2 zones/ model m205nclge12
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Submitted: 1 year ago.Category: HVAC
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Answered in 5 minutes by:
1/14/2016
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 22,373
Experience: 40+ yrs. experience as a licensed oil & gas technician.
Verified

Is this a Burnham boiler? Is the pilot lit all the time or do you have electronic ignition?

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Customer reply replied 1 year ago
pilot lite on all the time
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

Ok, first thing to check is the blocked vent switch (see attached pic)which is attached to the bottom of the bell shaped draft diverter. Push the small button between the 2 wires. If it clicks you have reset it and the burner will fire up with any luck. If it doesn't click it wasn't tripped. If that doesn't work I need to know if the motorized vent damper (which is above the bell on the vent) is open.

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Customer reply replied 1 year ago
I did that and nothing happened
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

Is the damper open?

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Customer reply replied 1 year ago
is there a way to bypass this to test it..
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

Please answer the question

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Customer reply replied 1 year ago
I am on my way to the job and will pay you more money when I get to it , so I am hands on with the unit
Customer reply replied 1 year ago
I will need a number to call you, and
Customer reply replied 1 year ago
are you there
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

A call is an additional charge and I have to step away for about an hour soon. If the damper isn't open and the pump is running (assuming 1 pump) then the damper is suspect. If the damper is open try jumping out the rollout sensor just above and outside the burner chamber. If that doesn't start it up then the damper end switch is suspect. Either way, damper not open or open and no fire the damper needs to be replaced.

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HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

Go for an aftermarket damper if you have the option since an OEM damper is twice the money.

If you still need a call then let me know and I'll call when I get back.

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HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

One other thing to check is the aquastat/limit. Jump the leads on the limit if the damper isn't open. If the damper opens then the limit is suspect.

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Customer reply replied 1 year ago
I have given up on this system as I changed the damper and ,the new damper opened 1 time and the pump and all other things stopped working at all.Now the new damper does not even do anything and
I put my 110 tester on the leads and it lit up the tester
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

What is the brand and model of your boiler?

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Customer reply replied 1 year ago
burnham
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

I don't get the 110 voltage reference. The damper is 24 volts. Sounds like you might have a thermostat or thermostat wiring problem. Try jumping the thermostat leads at the transformer (R & G or P & G depending on the age of the boiler)

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Rick
Rick
Rick, HVAC Supervisor
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Satisfied Customers: 22,373
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Experience: 40+ yrs. experience as a licensed oil & gas technician.

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