Question

The uint will run in heat Mode only if I load up the diaphram switch.
I simulate negative pressure on the hoses going to Swith pressure upper part XXXXXXX #21 and switch Pressure Lo. part #1011739 # 31 the unit starts right up. ( like a quick re-set ) The unit will run to thermostate setting and will not re-start.   It will also start up by disconnecting Switch Limit XXXXXXX #17 and runnes to TS Temp setting and will not re-start. What is going on.   I replaced the control fan timer and the Limit switch 10008445 still no change Imhad three technicians look at it already I am on a 10 year repair service contract with sears. I still have the heat running right. It is cold in NY, its in my fathers house and he is comming home from the hospital next week. I need to get the heat fixed ASAP. I have been with this problem now for three weeks and in communication with sears about 35 phone calls.
Tell me how to fix it I will do it myself. I am a engineer for gas insatllation for NG