My heater was running fine and it shut off without warning. As of now, the element heats up, the fan turns on and the heater will not ignite. I have checked the fuel line, it is clear. However I do not see any fuel coming out of the nozzle. I am not sure if this is a fuel line issue or an air pressure issue. What to do?

It should automatically restart.....BUT what happened is that when you unplugged it, you cut off the blower at the same time you cut off the heat element(s). The way it is supposed to work, is the thermostat cuts power off to the elements and the fan continus to run for a per-determined amount of time to remove al the heat from the elements. Then another 'fan control switch' shuts off the fan once the 'residual' heat is removed from the heater. Without that 'cool down' cycle, the hot element had enough 'residual' heat in it to trip off the 'thermal overload' in the circuit. The 'thermal overload'... or...'hi limit'...or...'hi temperature control' is resposible for shutting power off to the element(s) in the event that the blower fails.

I copied and pasted this answer from your other question as I thought it was the same one Sherry.... Hope it helps you.

It should automatically restart.....BUT what happened is that when you unplugged it, you cut off the blower at the same time you cut off the heat element(s). The way it is supposed to work, is the thermostat cuts power off to the elements and the fan continus to run for a per-determined amount of time to remove al the heat from the elements. Then another 'fan control switch' shuts off the fan once the 'residual' heat is removed from the heater. Without that 'cool down' cycle, the hot element had enough 'residual' heat in it to trip off the 'thermal overload' in the circuit. The 'thermal overload'... or...'hi limit'...or...'hi temperature control' is resposible for shutting power off to the element(s) in the event that the blower fails.

The problem is most likely the over heating sensor thermostat located directly under the heating elements - The reason the over-heat safety thermostat sensor is tripping the warning buzzer is because either the cool air fan intake is obstructed with dust / dirt, or the fan motor stopped rotating, or the over-heating condition thermostat is defective, or over sensitive - Usually when the cool air intake is obstructed for any reason, the heating elements will glow brighter, and hotter without good air flow, and the elements may start to bow downwards closer to the over-heating safety thermostat - However, if the safety thermostat is defective, it can trigger the warning buzzer even though there may not be an over-heating condition / event present - The buzzer warning going off prematurely also occurred with my Holmes space heater - I checked the air flow first, and then the appliance tip-over switch second - Both were found functioning properly - It wasn't until I replaced the safety over-heating thermostat, did the buzzer stop going off moments after I plugged the space heater in an outlet.

I believe these models have a thermal switch on or near the heating element that normally runs the fan until the element has cooled. Similar to your home furnace. If the fan never shuts off this switch is likely bad. IF it takes a long time to shut off then it may be out of calibration. In either case they are non repairable parts and have to be replaced. If the heater is in a high spot resulting in a high ambient temperature it may take a while for the fan to shut down.

Hi, these Honeywell combination fan/limit controls are used for turning the fan on after the combustion changer reaches the factory setting on the round dial that you see when you remove the cover. The high limit will turn the fan on when it reaches this temperature, and off when the stat is satisfied. If the blower motor fails due to a burn out or short, it shuts the main burners down on the high limit setting. These controls can be removed and you can clean the probe which has a set of contacts at the end. Sometimes this will fix the problem. Check the settings on the dial to see if they are set right to come on, the time it takes between cycles, and the temperature they are set to shut off. This sounds as though you need to check your thermostats also. They could be a problem. You say electric heat, but then you are saying flames? If these limits have the manual fan button, make sure they are on auto. Long delays could also mean you have a dirty flame sensor located by the pilot. You can clean the metal tip with steel wool or fine sanding cloth. Short heating cycles may be your thermostats like I said before. You shouldn't have to replace the fan/limits as I told you what they control. These will cause a fan to run and not shut off after the stat is done, so check to see if they are dirty. Please keep me posted.
Shastalaker7
A/C, & Heating Contractor

If the fan speed is not set correctly and running on low or medium for heat then the high limit could be tripping fan should be running in high speed for heat.

Is there a setting on the thermostat for Auto or Fan? If so, make sure it is in the Auto setting. You will have a contactor that turns on the elements and a relay for the fan. Follow the wiring diagram to see which relay energizes the fan then unplug it to see if the fan stops.

The problem is most likely the over heating sensor thermostat located directly under the heating elements - The reason the over-heat safety thermostat sensor is tripping the warning buzzer is because either the cool air fan intake is obstructed with dust / dirt, or the fan motor stopped rotating, or the over-heating condition thermostat is defective, or over sensitive - Usually when the cool air intake is obstructed for any reason, the heating elements will glow brighter, and hotter without good air flow, and the elements may start to bow downwards closer to the over-heating safety thermostat - However, if the safety thermostat is defective, it can trigger the warning buzzer even though there may not be an over-heating condition / event present - The buzzer warning going off prematurely also occurred with my Holmes space heater - I checked the air flow first, and then the appliance tip-over switch second - Both were found functioning properly - It wasn't until I replaced the safety over-heating thermostat, did the buzzer stop going off moments after I plugged the space heater in an outlet.

There is a safety switch which will shut the heater element off if the fan doesn't run. If the fan doesn't circulate air, the element would overheat and could possibly start a fire, so the switch will shut the element down. I'm not familiar with this heater, but I would check to make sure the fan is operating and also check for any filters that may be plugged and restricting air flow. If anything interferes with the air passing through the heater, the overheat switch will shut down the element. That's the best I can do from here. Good luck.

clean your flame sensor with a piece of wool