2 - Unit starts and then shuts off:
a. Check the brass fitting on the end of the regulator hose where it screws into the heater. There should be a black washer inside that fitting*. They have a tendency to fall out and remain in the plastic bag. Just push it back in. Without the washer, the pressure is not sufficient to sustain combustion.
*Note – the black rubber washer is on our older models. Our new models have a flared gas fitting and there is no need for the black rubber washer.
b. Water is being supplied by a pump or gravity and the pressure is falling as the unit is operated. When the pressure falls too far, the circuit that opens the gas valve will close.
c. High wind
d. Out of, or low on gas. Also a brand new propane bottle may have air trapped. This air messes up the fuel to air mixture in the combustion chamber. Have the customer cycle the unit on and off by starting and stopping the water flow several times, can be as many as 10, depending on the amount of trapped air. If this doesn't clear the air then the tank must be purged.
The easiest way to get rid of this is to close the valve on the tank, undo the hose from the heater, take the tank and regulator to a safe place. Open the tank valve for several seconds and let gas escape along with the air mixed with the gas. Close the gas valve on the tank and re attach to the heater.
e. One of the ignition sensors is bent and/or too close to the burner. Look to ensure that the ignition pins and the heat sensor are completely vertical and they do a 90 degree to the back of the box. If they are not straight (i.e. a 45 degree angle) then you can straighten them with pliers. Please call technical support at 866.356.1992 for assistance with this matter.
f. The thermocouple is either too high or too low to complete the circuit. Check to ensure that the thermocouple is flush with the hole in the heat exchanger. Please call technical support at 866.356.1992 for assistance with this matter.
e. The gas sensor wire might have come loose or is no longer connected. Please call technical support at 866.356.1992 for assistance with this matter.