How to Repair an Electric Heater: Fan Works But No Heat

A heater on a blue background.
What You'll Need
Voltage regulator
Screwdriver or hex driver
Replacement coil
Replacement circuits
Replacement regulator
soldering gun and solder
Wire caps
Wire clamp
Wire stripping tool

If the electric heater fan comes on when you turn on the heater, but no heat seems to be coming out, you could have a blown circuit or there may be a break in the actual heater coil. Most parts can be ordered directly from the manufacturer and installed quickly and easily. Before you can order the parts you need, you will want to check the unit thoroughly to detect the source of your problem. Replacing a circuit can be easy, whereas replacing or repairing the coil can be much more complicated.

Step 1 - Locate the Source of the Problem

If the electric heater fan comes on, and you are not getting heat, it could be a blown circuit or resistor or a broken heater coil. You will want to open the case and start testing the circuits with the voltage regulator. Look for breaks in the electrical path, and know voltages will change between circuits that are separated by resistors. Resistors are the little white cylinders that connect to the board here and there on two wires. Once you have checked the circuits, also look at the coil. You want to see if there is a break in the line anywhere. These wires work as a complete circuit, and if it snaps from heating and cooling over a long period of use, the circuit will be broken and not give off heat.

Step 2 - Replace Burnt Out Circuits and Resisters

If you have determined that the circuits or resisters on your unit are the source of your problems, then simply use the soldering gun to heat the contacts and remove them. Replace them with parts that meet the voltage standard for their job. This will prevent you from having issues with short-circuiting in the unit. If this was the only problem you could find, put the case back together and turn it on, checking the electric heater fan for warm air.

Step 3 - Replace the Heater Coil

The coil is what will heat up, which builds temperature for the electric heater fan to blow into the room. Modern heaters generally have a replaceable heater coil unit that can simply be installed. Make sure you follow power down procedures before removing the coil to avoid electric shock or short-circuiting. Find the electrical connections on the coil and remove them, and then dismount the coil. Install the new coil and close the case up. Be sure to reconnect everything properly before turning it on.

Step 4 - Repair a Heater Coil

In older units, the electric heater fan is not connected to the temperature gauge. This usually means that the coil is going to be more difficult to replace, as they were not built for maintenance. To repair one of these, you will need a heat resistant metal wire clamp. It should be made of a conductive material such as steel so the current will pass through it to the connected wire. Take the two broken ends and clamp them tightly together to repair the broken circuit.