Pressure Switch Questions
Posted: Fri Dec 03, 2010 5:42 am
Hi.
I have a Coleman DGAA070BDTA, and I'm getting three flashes on the Control Board telling me it's not seeing the Combustion Air Switch close.
Being an Electronic Tech by trade, I took this switch off and grabbed my DVM. It appeared to be stuck open because only after I applied pressure, then suction VIA blowing into it (which I just read I shouldn't have done), I started seeing a reading on the DVM; around 200 ohms. This leads me to my questions:
1) Are the presure switches delicate, as in only a minute amount of pressure would make a working one close? Did I destroy this Presure Switch by blowing into it?
2) What resistive reading should I expect to see from a working switch?
3) The fan in the flue works, but it doesn't seem like it would create enough pressure to close the switch, which I'm assuming is causing it to fail.
Thank you for all your help!
Thom
I have a Coleman DGAA070BDTA, and I'm getting three flashes on the Control Board telling me it's not seeing the Combustion Air Switch close.
Being an Electronic Tech by trade, I took this switch off and grabbed my DVM. It appeared to be stuck open because only after I applied pressure, then suction VIA blowing into it (which I just read I shouldn't have done), I started seeing a reading on the DVM; around 200 ohms. This leads me to my questions:
1) Are the presure switches delicate, as in only a minute amount of pressure would make a working one close? Did I destroy this Presure Switch by blowing into it?
2) What resistive reading should I expect to see from a working switch?
3) The fan in the flue works, but it doesn't seem like it would create enough pressure to close the switch, which I'm assuming is causing it to fail.
Thank you for all your help!
Thom