Model R100B. Fan runs. Why doesn't it ignite?

on the thermal switch there is 3 wires going into it that turns on the fan at temp and also tells the ecu what temp the engine is at. both radiators have them fitted to them.

Replace the 2 burner coils ,if the igniter keeps cycling trying to start the flame. If it doesn't replace the flame sensor mounted on the side of the burner tube.

This could be due to a intermittent micro switch, or a faulty cooling fan. This is critical in keeping the magnetron cool when cooking.

The fan runs for a short time, after ignition off, to continue to cool the hot engine.

Sounds like the fan limit was not replaced correctly. You can try switching the blower to the On position (instead of Auto), if the furnace runs properly with the blower on that would be the most likely culprit.

the belt broke,you can buy a kit with the belt,rollers and pulley,change out everything and you'll be good to go.next time send the model number.good luck.while you have the dryer apart,vac out all the dust and lint and if you have a shop vac put it on blow and blow the motor out and clean out the duct that the lint filter slides into,also if your vent line is a long run remove it from the back of the dryer and blow it out with a leaf blower if you have one.

Can't remember where they are exactly on yours but there are a group of three or four relays either back on one of the fenders or on the firewall. One of those is for the fan.

How did you determine that the sensor failed. Did the check engine light come on? When you say that the fan won't turn, do you mean that it won't turn on and run or that you can't physically turn it by hand. To determine this, disconnect the electrical connector to the fan and try to turn it by hand. It should turn easily. If it doesn't then it must be replaced. If it does then reconnect the electrical connector to the fan and try to operate it by disconnecting the temperature sensor lead and placing a jumper wire between the terminals of the harness. turn the AC control to AC/MAX and turn the ignition key to on. If the fan runs then the problem is the sensor. If it doesn't then check the fan control relay and any related fuses. WARNING : Use extreme caution when testing the fan circuit. Never attempt to turn the fan with the electrical connector in place. The fan can operate at any time even if the engine is off.

Not familiar with the R100B unit. Is it kerosene, propane or something else. Anytime a combustible heater gives off fumes it is not burning the fuel completely. This could be clogged filters, wrong fuel ratio or something else. Send me more info and I will try to solve your problem.

hardrocko

You don't say, but I am assuming that the motor is running and there is combustion in the combustion chamber and the heater is running fine, then the reset trips. Is this correct? If so, chances are the Safety Control (reset) is defective. Part number HA3003. The photocell could also be at fault. Check for a dirty lense on the photocell.

But---If there is no combustion in the chamber, then the photocell detects a no-flame condition and then it trips the reset.

Troubleshooting tips for a Spark Plug type heater