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Re: gas wall heater shuts off @ 70*
The over ride button is on the thermostat? It sounds like the thermostat is programed to cut out at this temp. If you want to try, remove the thermostat and connect the white and red wires together, don't worry, they are only 24 volts, you wont feel it. Like this the heater will run continuously. I don't know what type of heater you have so after a few minutes (4 or 5) the fan doesn't come on you need to attach the green wire to the white and red, but I don't think you will need to. If this does as I said, then the thermostat needs to be re-programed, or replaced with a simpler model that is not "energy efficient."
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Dave, make sure that the gas valve on the Propane tank, is fully open and that the inline gas shutoff valve near the heater is turned ON. Those are the basic two things that would prevent the gas from flowing thru the gas line, to the heater.
If the above valves are ON, the problem then lies with the gas control valve on the water heater. If it has pilot light that has to be lit, make sure that the heater's gas control valve is properly in the PILOT Position, before attempting to light it. It must be able to be pushed ALL the way in and you should feel strong pressure pushing back at you (other than spring pressure). When you feel that, it's in the PILOT Position and ready to be lit. Once it's lit, continue to hold the Pilot Button in for 1 minute, then release it. If the Pilot stays lit, turn it to the ON Position.
Hope this helped you to troubleshoot and solve the problem. Please let me know. Thanks.
What you are experiencing is the lack of a signal from the thermocouple to the gas valve. I.e. the thermocouple is not passing heat information at all. This is caused by either a defective thermocouple, a dirty mating area where the thermocouple connects to the gas valve or... an improperly positioned thermocouple that is not "in the flame" with the pilot lit.
First make sure the FIRE end of the thermocouple is in the flame when lit. (reposition if necessay)
Next disconnect the thermocouple by unscrewing the fitting on the top of the gas valve. (No gas will come out) Clean the metal mating area as best you can and then re-install the thermocouple. Just a good snug fit. Once you feel it come snug add 15 degrees of tightening motion with a wrench.
Attempt to light the pilot... wait 45 seconds to 1 minute while holding the pilot button down before letting it up. If it stays lit.... GOOD JOB. If it goes out the next step is to replace the thermocouple. If after replacing the thermocouple it does not stay lit the remedy is to replace the gas valve. There are no short cuts and the sequence of repairs is just as I stated in order.
You can remove your old thermocouple and walk in to almost any appliance parts supply or Plumbing and heating supply to purchase the correct thermocouple without a part number. They will match it up with yours.
When you light the pilot, hold the button in about 1 minute to satisfy the thermocouple. Once the thermocouple is hot and satisfied, turn the gas to "ON". You may have to extend the time a bit, but 1 minute is usually enough.
you could have a overdraft problem causing your flame to go out. check your draft setting at the burner and make sure it's not open too wide. If it is, simply close it it slowly and make sure that the flame remains totally blue.
Does it have a standing pilot light? On new units, there is an igniter and not a pilot. But if you have a standing pilot, you will move the gas valve to "pilot" and push down the red button while holding a flame under the pilot located by one of the jets. Once it lights continue to hold the button down for a minute or so and then release the button. The pilot should stay lit. Then turn the dial to the on position. That's it.......... If the pilot won't stay lit then the thermocouple is bad and needs to be replaced.
Bad thermocouple that senses the heat from the pilot light. This would be evident if you lite the pilot while holding the button down for about 30 seconds. If the pilot goes out as you release the button on the gas valve replace the thermocouple.
The thermal couple that senses the heat from the pilot and holds the gas valve in the ready condition must be bad. It is not difficult to replace. Note: When you first lite the pilot flame you must hold the button down for at least 30 seconds before releasing it. Also check the size of the pilot flame that contacts the thermocouple.
On these older gas water heaters there is a gas control with temperature selection and below that is a removable cover. Once you remove the cover you can gain access to the pilot. You must rotate the knob on the top of the control to the pilot position. When in the pilot position, hold the red button down and light the pilot. Continue to hold the button down after the pilot is lit for about one minute. If when you release the red button the pilot goes out, try one more time. If it goes out again after releasing the button your thermocouple is bad and must be replaced. The thermocouple generates a millivolt electrical current that hold the gas valve in the operating condition when the pilot is lit. When the pilot goes out there is no heat to generate this small electrical field.