Rheem furnace error code 13 happens when the furnace is not able to reach the set temperature within a certain amount of time. There are a few reasons why this can happen: the furnace is not getting enough power, the furnace is not properly vented, or there is something blocking the furnace's intake or exhaust. If the furnace is not getting enough power, you'll need to check the circuit breaker and make sure the power is turned on. If the furnace is not properly vented, you'll need to check the venting to make sure it's not blocked. If there is something blocking the furnace's intake or exhaust, you'll need to remove the blockage.
1. Check for blockages in the flue or exhaust pipe
- Check for obstructions in the flue or exhaust pipe by using a flashlight and a long, flexible snakelike instrument. If there are any obstructions, remove them using a pipe wrench.
- If there are no obstructions, check for blockages by using a vacuum cleaner and a hose. If there are any blockages, use a plunger to clear them.
- If there are still blockages, call a professional to fix the rheem furnace error code 13.
2. Clean or replace the furnace filter
- Turn off the power to the furnace by flipping the main switch.
- Open the panel on the furnace and locate the furnace filter. It is usually a cloth or paper filter.
- If the filter is dirty, remove it and wash it in warm soapy water.
- If the filter is in good condition, replace it with a new one.
- Close the panel on the furnace and turn on the power to the furnace.
3. Check for a faulty or disconnected thermostat
If the thermostat is not responding to temperature changes, it could be faulty and need to be replaced. To check for a faulty or disconnected thermostat, you will need to remove the cover on the furnace. Beneath the cover is a thermostat housing. The housing should be connected to a metal heat exchanger or radiator. If the housing is not connected to the heat exchanger or radiator, the thermostat is likely faulty and needs to be replaced.
If the answers above didn't work then you should also try:
- Check for a blown fuse or circuit breaker.
- Check for a clogged burner or restricted air flow.
- Check for a cracked heat exchanger.
- Call a qualified heating technician for assistance.