I have the pro reddy 100 LP heater. I haven't run it for some time, but when I get it lit and hold the control in for warm up, but after 30 seconds I let it out & the heater goes out immediately. can somebody tell me what is wrong? The thermocoupling looks red hot.

Heating & Cooling - Reddy - Heater RLP100 Portable Forced Air Propane Heater with...