Obsolete direct vent gas-fired wall heater

It's been cold and I fired up an old Sears heater. Works great but it won't really turn down very low. The thermostat doesn't really change the output. Don't have a manual, must turn off the gas valve to turn off the burner.
http://www.searspartsdirect.com/partsdirect/part-model/Kenmore-Parts/Furnace-Parts/Model-867734951/0582/0912130/00006194/00002
That's the parts diagram and you can see it is just a basic heater that Sears doesn't stock many parts for any more.
Is it worth banging on the valve or wiggling the thermocouple? If I needed the $185 substitute gas valve, I'd probably be better off buying a whole new heater.
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Stumpy,
The gas valve has a long copper cylinder called the bulb which senses the air temp. It's probably dead and is not replaceable. You need a new valve or a new heater.
Dave M.
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Well, it probably was installed in the '60s. Should be retired.
Northern Tool sells a similar one for $400 new. Makes more sense than spending almost $200 to repair the decrepit one.
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I just looked up "modulating, bulb-type thermostat" and realized that it would adjust the size of the flame rather than turn it on or off. Maybe the adjustment range is too small, and I could adjust the spoiler screw on the burner to reduce the size of the flame. It's rated at 14,000 BTU/hr normal output and bakes us unless it is <45deg outdoors.
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Stumpy wrote:

Did you read the Recall Notice by those diagrams?
--
Bill
In Hamptonburgh, NY
  Click to see the full signature.
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Yes I did, but it looked like it was specifically for LP gas setup. I'm natural gas here. It didn't say what date the recall was.
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