M1MB 070A BW Pressure switch

[Dee Jessica]

Hi,
My daughter is getting a red flashing light on her furnace and the furnace will not turn on. It flashes twice which indicates the pressure switch is closed.
We replaced the pressure switch, made sure the tubes are all clear. Turned the furnace back on, it is still blinking 2 red flashes.
I can hear the click for the automatic starter but no glow, no gas smell!
Any Ideas of what else we can try?
Thanks
Dee

[Robert]

Hi Dee,

There are a few things it could be and to know would require testing the entire circuit electrically.

Booster Motor, control board, gas valve, ignitor, etc.


Best to call an hvac tech to ensure proper diagnosis.



Thanks,
Robert