Ignitor Glows Red and when it clicks, only 3 V goes to the valve.

Old 11-30-15, 11:26 AM
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Ignitor Glows Red and when it clicks, only 3 V goes to the valve.

Bryant Plus 80 Gas Furnace
Manufacturing Date: 1995

- Inducer Motor starts up
- Shortly after inducer motor starts, the ignitor gets glowing red
- A click is heard and the valve gets 3V
- No gas / flame
- Cycles 3 times then fully shuts off

I'm assuming a bad board???
What is the life expectancy of a furnace?
Should I be focusing on getting this one repaired or after 20 years should I consider replacing it?
Old 11-30-15, 02:24 PM
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The circuit board should turn 24 AC on to open the main burner gas valve.

Personally, I'd go ahead and replace the circuit board. The circuit board performs MANY functions in the furnace which used to be performed by separate parts. By replacing the circuit board, you renew all of those many functions.

Many furnace of this kind have furnace blower motors which should be oiled every five years or so. If you look carefully, you may be able to see one oil port on the blower motor. But there are two, and the second one requires that the blower assembly be removed and the blower motor taken out to oil the second oil port.

If you want to keep the furnace, I'd spend the 1-2 hours needed to oil the blower motor some afternoon when it's convenient. Takes some time, but not especially difficult.

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