Control Board Setup
The Control Board is designed to work with both the Stack
Flue Switch (on older heaters) and the Stack Flue Sensor
(newer heaters). Please see Figure 2 to identify which type
of Stack Flue protection you are replacing.
NOTICE:
If you have a pump module installed with your
heater, skip this procedure and go to the pump module
instruction manual. Follow the instructions for accessing
“SF0/SF1” under Low Level Programming. The Control
Board must be set to “SF1” for the heater to operate with a
Stack Flue Sensor installed.
If you are replacing a failed Stack Flue Sensor, your Control
Board should be set correctly for the new one. However, if
you are replacing either an Outdoor Stack Flue Switch or
an Indoor Stack Flue Switch, the Control Board will need
to be reset as follows:
1. Turn the power to the heater ON.
2. Press and hold the OFF button on the membrane pad
until the 3-digit display shows “Ad0” or “Ad1” (about
10 seconds).
3. Release the button and then press it momentarily. The
3-digit display will now show either “SF0” or “SF1”.
4. If the display reads “SF1”, it is correctly set. Go to Step
5. If it reads “SF0”, use the arrow buttons on the mem-
brane pad to set it to read “SF1”.
5. Momentarily press the “OFF” button to exit the pro-
gram. See the heater owner’s manual for normal heater
operation instructions.
Safety Precautions:
Burn hazard. If heater has been operating,
allow it to cool for at least half an hour before touching
the Stack Flue Switch or the Combustion Chamber Collar.
REPAIR PARTS LIST
Part
Part
Description
Qty.
No.
Stack Flue Sensor
1
42002-0024S
FIGURE 2 - Stack Protection Identification
3674 0300
Stack Flue Sensor;
1/2" Hex, 2" Leads:
Set Board to SF1
Outdoor Stack Flue
Switch (Obsolete):
Set board to SF0
Retrofit Probe (also
called Indoor Stack
Flue Switch); 3/4"
Hex, Terminals: Set
Board to SF0
