When I plug the heater in, the fan starts, and the igniter is firing...when I move the dial to the "low/ignite" setting and keep it depressed, it fires up; when I release the dial, the igniter is still clicking. When I move the dial to med or high, the igniter still sparks. Is this supposed to happen?
I just received this from a friend and there is no manual. I'm not sure if the spark keeps it lit, or if it should shut off once I release the dial. There is s tube inside that glows red, so I figured that is what generates the flame.
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All appearances - No fuel to ignite!
evrything else looks good, proper gas pressure, proper volts at igniter, etc - it should ignite! If fuel present, heater should Fire!
make sure all valves are open.
Gas valve is ON
AND purge any air from gas line.
IMPORTANT ****. If you bled gas line, don't try to ignite for a few minutes. Allow gas to dissipate first, use a fan to help.
Check the wiring for the fan and the temperature sensor. If the fan isn't running/broken the unit will not start or ignite. Try moving the fan blades with the unit unplugged. If they don't move easily or are ceased the fan may need replacing or lubricating. The heat in these units dries out the fan bearings over time.
These models require electrical power to run the blower fan.
When you connect the electrical cord, the fan should turn on, then you should be able to start / ignite the propane. if the fan does not turn on when you connect the power cord, you will not be able to ignite the propane.
If the heater will not ignite, this maybe caused by low pump pressure or perhaps a fuel blockage, or could be caused by too much air from the fan, the hot surface igniter heaters are very sensitive to this kind of problem. Will the heater start with the top cover removed?? If so try closing down the angle of the fan blades a little, but not too much, to reduce the air forced into the combustion chamber. If the heater will not start with the top cover removed, try adjusting the pump pressure, or replace the nozzle. This may not be very scientific, but the solution maybe by trial and error, and can be very frustrating! Hope this helps.
I am not familiar with this model, but in general when it says to push the button it will start the sparking sequence to lite the pilot or burner once it lites and proves flame then the sparking should quit. Something must of broken and is keeping the spark staying on. It should not be sparking all the time. Hope this helps.
Most furnaces are equiped with a two speed blower. Hi speed is controlled by a relay sytem initiated by the thermostat. short of a stuck relay, hi speed should not remain on unless your thermostat "fan swith" has been moved from "auto" to "on", if this is the case turn the switch to "auto"
Low speed is controlled solely by the furnace itself. Depending on the age and brand of the furnace it is either brought on by time or temperature.
From your description of "tapping the relay of the limit switch" I assume you have an older furnace with a combination fan/limit control. The most common of these were a grey box with a removeable rectangular lid. In some cases there was a (commonly white) switch poking through this cover which you could manually turn low speed on if you pushed it in, make sure it is pulled out.
Otherwise the switch is refered to as a bi-metal limit. When heated the two dis-similar metals (coiled together) expand and contract at different rates. When the furnace cycles on, the metals heat and, due to design, twist a dial, which you should be able to see under the rectangular lid. The dial should have three pin settings for the purpose of switching. the lowest setting, usually around 105, is the fan OFF setting. The second, usually aroun 135, is the fan ON setting. The highest should be fixed around 250 it is the high limit and should not be part of your problem.
....After your thermostat has been satisfied and the flame shuts down...you can physically watch that dial move clockwise and hopefully reach the setting of around 105, unlesss that setting is set below the temperature of the room the furnace is in (try setting this setting higher to see if it helps).
(make and age of furnace helps a lot with trying to trouble shoot, also is it a mobile home unit?)
There are many different things it could be with the fan comming on that means the heater is trying to fire. Make sure gas supply is on first of all. Depending on the gas line run you may have to try several times of turning on and off the heater to reprome the line. If no luck with that the next step is the igniter follow the small tube comming off the gas valve and folliw it to the burner tray try poking a small peice of wire through it from a wire brush it probally is plugged. Heater should fire after that.