STEP
ACTION
YES
NO
GO TO
11
Is 24-vac across YELLOW wire to the low heat pressure
switch LPS and COM-24V on variable speed furnace con-
trol?
14
12
12
Is 24-vac across connector terminal PL1-2 and C
OM
-24V on
variable speed furnace control?
13
18
13
You have an open wire or bad terminal on the YELLOW
wire from the variable speed furnace control to the low heat
pressure switch LPS. Repair it or replace the harness.
8
14
Is 24-vac across ORANGE wire on the low heat pressure
switch LPS and COM-24V on variable speed furnace con-
trol?
15
19
15
Is 24-vac across connector terminal PL1-4 and C
OM
-24V on
variable speed furnace control?
18
16
16
Turn power off and disconnect jumper wire across R and
W/W1 thermostat terminals.
17
17
You have an open circuit between the low heat pressure
switch LPS and the variable speed furnace control. This
includes all the ORANGE wire interconnecting the low heat
pressure switch LPS to the variable speed furnace control.
It also includes the low gas pressure switch LGPS (if used).
Check the continuity across the low gas pressure switch
LGPS (if used). If there is no continuity check the propane
line pressure. If the propane line pressure is correct replace
the low gas pressure switch LGPS.
Check the continuity of each ORANGE wire interconnecting
the low heat pressure switch LPS and the variable speed
furnace control. Repair open wire or replace harness.
8
18
Replace the variable speed furnace control.
8
19
Replace the low heat pressure switch or the pressure
switch assembly.
8
Status Code 45
CONTROL CIRCUITRY LOCKOUT - This status code indicates the variable speed furnace control detected
one of the following:
1. Flame sense circuitry failure.
2. Software check error.
3. Gas valve relay stuck open.
Auto-reset after 1 hour. Replace variable speed furnace control if status code repeats.
CLEANUP AND START-UP INSTRUCTIONS
1. Start furnace using procedure outlined on Lighting Instructions attached to furnace. Observe operation of furnace through at least 1
complete heating cycle controlled from the room thermostat. Observe cycle for 20 minutes or until a status code is flashed. If status code
flashes, refer to the Index.
2. Recycle as necessary and check thermostat heat anticipator setting, gas input rates, and temperature rises. These procedures are outlined
in Installation, Start-Up, and Operating Instructions.
3. Check operation of safety devices: limit switch and flame rollout switch.
4. Put all setup switches in their proper positions.
5. Remove tape from the door switch.
6. Replace thermostat leads (if necessary).
7. Set thermostat in AUTO position, calling for heat.
8. Set thermostat to desired temperature.
9. Replace the blower access panel and furnace door. Clean up.
34