Older Rheem shutting down.
#1
10-29-17, 01:43 PM
Older Rheem shutting down.
I have an older Rheem 80 plus from I think 1987. I tried to fire it up last week for the first time since spring. Put a new filter in and found out once the furnace was going for about 10 seconds the flames went out. The circuit board only has an LED with a max of 3 codes. It was blinking twice which indicated a weak flame signal. I don't have a flame sensor rod but it is an HSI unit. The HSI is about 4 years old. I put an ohm meter on it and got 158 ohms. Since pulling it out, inspecting it and reinstalling it now fires for 4 seconds and flashes 1 flash indicating ignition lockout.. only other thing I have replaced was the circuit board 2 years ago. I read the HSI should be around 40-70 ohms. Thought?
#2
10-29-17, 02:05 PM
Group Moderator
Welcome to the forums.
Your HSI does sound like the resistance is a little high although that usually doesn't affect its flame sensing ability. The HSI does need to be fully engulfed in the flame though.
Your HSI does sound like the resistance is a little high although that usually doesn't affect its flame sensing ability. The HSI does need to be fully engulfed in the flame though.
