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Old 01-30-2008, 12:36 AM   #16
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old Miller heating furnace won't ignite gas


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Originally Posted by redline View Post
An inexpensive volt meter can test this.
I was finally able to borrow a volt meter. I tested the two wires going to the ignitor. The needle jumps for a fraction of a second when I turn it on but that's it. So there's no power going to the ignitor after switching it on.

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Old 01-30-2008, 07:18 PM   #17
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old Miller heating furnace won't ignite gas


I concur with bigMikeB. If the ignitor doesn't heat up and you think the gas valve is opening, you have a bad problem. You better call for help. The gas valve should never open until the control module confirms the ignitor is hot by monitoring the current through it. Again, for safety sake, call for help.
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Old 01-31-2008, 10:27 AM   #18
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I concur with bigMikeB. If the ignitor doesn't heat up and you think the gas valve is opening, you have a bad problem. You better call for help. The gas valve should never open until the control module confirms the ignitor is hot by monitoring the current through it. Again, for safety sake, call for help.
The money just isn't there to call a pro. A new ignition control would cost about $150 which we can barely afford. Unless there's a pro in the Northeast Philadelphia area that's willing to do the job pro bono or at least very cheap. I could provide proof of our low income.
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Old 01-31-2008, 05:14 PM   #19
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old Miller heating furnace won't ignite gas


Think about how it is supposed to work. Thermostat calls for heat, control module starts inducer fan, fan runs for a few seconds for purge and to change pressure in the combustion area and assure positive vent, pressure switch responds to pressure change and closes, control module acknowledges and turns on ignitor, ignitor current changes as it heats up and when the current is right module opens the gas valve, hot ignitor ignites gas, flame sensor senses flame and module is happy and keeps gas valve on until thermostat is happy. If anything fails to work module will shut down the process and fault out with code telling you why it did. If all connections are good, inducer fan will run and pressure switch makes, but ignitor doesn't get power, then the module must have failed.
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Old 01-31-2008, 06:59 PM   #20
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old Miller heating furnace won't ignite gas


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Originally Posted by hoistdoctor View Post
Think about how it is supposed to work. Thermostat calls for heat, control module starts inducer fan, fan runs for a few seconds for purge and to change pressure in the combustion area and assure positive vent, pressure switch responds to pressure change and closes, control module acknowledges and turns on ignitor, ignitor current changes as it heats up and when the current is right module opens the gas valve, hot ignitor ignites gas, flame sensor senses flame and module is happy and keeps gas valve on until thermostat is happy. If anything fails to work module will shut down the process and fault out with code telling you why it did. If all connections are good, inducer fan will run and pressure switch makes, but ignitor doesn't get power, then the module must have failed.

I could be wrong about the gas valve opening. It might just be the inducer fan I'm hearing and I thought gas was coming out. I'll shop around for the ignition control module. Thanks for the advice.
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Old 02-01-2008, 11:43 AM   #21
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Let me know what happens.
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Old 02-01-2008, 12:05 PM   #22
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old Miller heating furnace won't ignite gas


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Let me know what happens.
A family member got me in touch with a friend who is a licensed contractor and will get me the part under their contractors discount. I'm waiting right now for a call with the price. I will definitely post again with the end results. Thank you very much again for your explanation which I did completely understand.
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Old 02-07-2008, 12:15 PM   #23
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old Miller heating furnace won't ignite gas


I just hooked up a replacement ignition control module (White-Rodgers 50E47-843). Seems like everything is hooked up right. I'm getting a green light on the module. The ignitor still won't light though. I checked the ignitor terminals with a volt meter. Not getting any voltage. Obviously the problem lies somewhere else then?
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Old 02-07-2008, 12:26 PM   #24
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I just hooked up a replacement ignition control module (White-Rodgers 50E47-843). Seems like everything is hooked up right. I'm getting a green light on the module. The ignitor still won't light though. I checked the ignitor terminals with a volt meter. Not getting any voltage. Obviously the problem lies somewhere else then?
I wasn't giving it enough time for the ignitor to light. It's taking about 40 seconds for the ignitor to light up. Is this normal? The problem now is it seems the gas valve isn't opening.
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Old 02-07-2008, 01:09 PM   #25
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old Miller heating furnace won't ignite gas


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I wasn't giving it enough time for the ignitor to light. It's taking about 40 seconds for the ignitor to light up. Is this normal? The problem now is it seems the gas valve isn't opening.
Well now I wasn't giving it enough time for the gas valve to open. The gas valve opens about 30 seconds after the ignitor lights. So everything seems to be working fine now.

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