If there is a brown copper line coming from gas valve is a thermol couple , and is bad when reinstalling don't over tighten it can damage the seat on the valve .
Possible the thermocouple bulb has slipped out of position and isn't being heated as it should. If it is a model with a pilot light, perhaps it is blocked.
The thermocouple is probably the most likely culprit.
SOURCE: Torpedo heater wont stay lit.
Do you have the serial number or the manufacture date? There are some design changes and I would need to know the year of manufacture to assist accurately. Usually it is a relay or the thermocouple connection that will affect the unit staying lit.
SOURCE: Reddy Heater will not stay lit
Thermocouple it going bad had same problem, you Should replace it.
SOURCE: L.P. Propane Heater not staying lit
Sounds like you have a bad gas hold on valve. I have a tip at http://www.fixya.com/support/r4258201-fix_gas_reddy_heaters_will_not_continue which explains the problem, how to fix it and where to get the parts. Let me know if you need more help.
Thanks for using FixYa and for the generous rating.
hardrocko
SOURCE: I have a PRO100 Reddy Heater would not stay lit
I had the same problem. Heater was propane with a long hose for movement.
I put the heater on my garage work bench and the thermocouple tested okay.
Tried to restart and it ran like a champ. Reassembled bottom panel, retested great.
When I set it on the floor, it went out! Hmmmm.
Restarted back on the benck. Great. No good on floor....Very cold (28 F) in the garage.
Think the propane might be going liquid in the hose...when heater hose has a "drip loop"
it works fine.
Maybe this is nuts, but it works keeping the heater up a bit on a STABLE surface.
Jim
SOURCE: replaced the thermocoupler on a propane reddy
Replace thermocoupler you tighten it to tight. Ken's Repair
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