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ComfortZone
ComfortZone, HVAC Technician
Category: HVAC
Satisfied Customers: 516
Experience:  10 years in the HVAC industry.
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american standard trane MODEL tud08ob942a0 HOME GAS FURNACE

Customer Question

american standard trane MODEL:tud08ob942a0 HOME GAS FURNACE with honeywell S8910V IGNITION MODULE NOT STARTING. FAN WORKS,COMES ON. SOUNDS LIKE IGNITER SOLENOID HITS THREE TIMES THEN SHUTS DOWN THEN LED FLASHES 3 TIMES = IGNITION LOCKOUT.. FLUE VERIFIED TO BE CLEAR. IS IGNITER BAD?
Submitted: 7 years ago.
Category: HVAC
Expert:  ComfortZone replied 7 years ago.

Sounds like the ignitor has cracked. Pull it out and check it.

 

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Customer: replied 7 years ago.
it looks crudded up but not cracked. what should ohms be? if shows infinity is it bad?
Expert:  ComfortZone replied 7 years ago.
Yes. That means it is open. The crack could be miniscule. Do you have 120 volts going to the ignitor from the control board?
Customer: replied 7 years ago.

don't know yet, will check when I get home from work. I am working thru this with my son and I have the VOM with me. I'll see if he can use his current detector to see if he is getting any AC at all off the board/igniter connection

Expert:  ComfortZone replied 7 years ago.
let me know
Customer: replied 7 years ago.
will do , thanks. I am 70 miles away from the unit and he is not experienced enough to troubleshoot on his own. Does it sound like the exhaust flue pressure sensor is okay?
Expert:  ComfortZone replied 7 years ago.

More than likely. You can determine that by taking the leads off and checking for continuity between the terminals when the vent motor is running. But I think the problem is with the ignitor.

 

 

 

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Customer: replied 7 years ago.
ignitor had cracked, my son just didnt recognize it as a crack!

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