Original message
| t1551fo
 |  "Armstrong ultra 90"
, posted Thu 2 Oct 20:08  
Had problum with ignitor,replaced it with new unit, pilot comes on heats up probe, small blower and main blower come on no main burners what can i check next all conneection on circuit board look good
18892
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Replies:
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| Jojo98
| "Re(1):Armstrong ultra 90" , posted Fri 3 Oct 20:08
If your safeties are closed, then check to see if you are getting 24v to the main gas valve. Call for a demand for heat, and listen for a click noise coming from the MGV, thats the solenoid energizing and allowing gas to flow.
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