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Roger, you either have a gas supply issue or a voltage problem.
Since I don't know your aptitude and abilities pertaining to LP gas troubleshooting/testing procedures, I don't know how detailed you want to go...basically, make sure your propane tank isn't empty; or that the pressure regulator didn't freeze up. Make sure that it is rated and set for 28" of water column output.
Check to make sure all the wire connections are secure to the flame control terminal block and to each of the hi-limit switches.
Isolate & perform continuity checks to each electrical component, including the gas valve.
You'll need a manometer to test and set the gas input & output water column levels.
When the unit is running,, what color is the flame?
Is there a roaring sound?
Is the flame small and weak?
Turn off the propane tank and disconnect the heater hose from the tank. Wait 5 minutes and reconnect the heater hose/regulator to the propane t. Turn the tank valve on very, very slowly until it's completely open again. Now, try lighting the heater. If you are using a 20lb LP grill type tank, that should solve your problem.
Did someone possibly turn the control knob from ON position to the Pilot Position. If that's the case, the burner won't come on.
Another thing that might cause your problem is low gas pressure. If you have LP Gas, the regulator on the gas tank may be frozen or the tank may be almost empty.. This happens frequently when temperatures remain well below freezing. To test this theory, soak a bath towel in hot water, ring it out and quickly place it around the LP tank's regulator. This will thaw the regulator and allow gas to flow smoothly to your heater. Remove the wet towel from the regulator once it has thawed.
If the freezing continues to occur, wrap insulation around and inside the bonnet of the tank. You may also want to contact your propane provider about this. As they may need to add some ethanol to your tank.
This heater is designed to work with LP gas. You will need a regulator from the tank to the heater set at 11"wc .that's standard for any LP gas system. Your existing piping system should have a regulator already outside of your house before the gas inters your home .If it does not then you will have to install one. The regulator can be inside but you will have to run a vent line in copper from the regulators vent to the outside of your house.
Too much gas pressure. Are you sure that this is a LP heater and not a Natural gas heater? Is the regulator you have rated under 1/2 pound pressure? Try to throttle down the shutoff on the tank to see if pilot gets better. If so, you have a pressure issue. Gas you adjust the pilot gas valve?
I have never seen a dayton gas heater but I will try. If this is an LP Gas
System are you using a 30lb. Cylinder, 100 lb cylinder or a whole house
Next are you sure you got the right gas unit for the right gas system?
If using LP gas did you put an external pressure regulator before the unit?
Next is the a hot surface glow coil or a spark system ignition system?
If you have to hold the controller down and press a button similar to a outdoor gas grille is it sparking?
If it is sparking,did you bleed all of the air out? This could take several
tries on a new unit. Does this have a wall mounted thermostat that
controls the heater? Finally check to make sure that the gas valve
is switched on if it has that option.
These heaters are not designed to be operated below 40 degrees F. If the heater is used below 40 and if you have a gas tank containing less than 25%, the unit will not operate for long and will start going out. If the heater all of a sudden goes out without showing any flickering or pulsations, you have a bad gas valve, there is no thermocouple on this model. Fill your tank and try the heater again. If it continues, give Coleman a call at 800-835-3278.