- 13 -
STEP ACTION YES
NO
GO
TO
12.
Ensure the gas inlet pressure and burner orifice are correct. Then adjust the gas valve to the
proper rate. If it cannot be adjusted to the proper rate, replace the gas valve.
9
13.
Is outdoor condensing unit operating during heating cycle?
16
14
14.
Check temperature rise and external static pressure with blower access panel in place.
Temperature rise should be mid range or higher than midpoint of range stated on furnace rating
plate. External static pressure must not exceed .7 in.w.c. If return temperature is below 60
deg. F condensation may form on heat exchangers. If left uncorrected failure will result.
15
15.
Check return air ducts in unheated spaces for leaks.
9
16. Fix
problem.
9
Status Code 11
NO PREVIOUS CODE - Stored status codes are erased after 72 hours or can be cleared by jumpering R, W/W1, and Y/Y2
thermostat leads while setup switch SW1-1 is ON. Run system through a heating or cooling cycle to check system.
This usually indicates one of the following:
- The status history has been cleared and setup switch SW1-1 is in the ON position.
- Component test was successfully completed and setup switch SW1-6 is in the ON position.
STEP ACTION YES
NO
GO
TO
1.
Remove the blower access panel, depress the door switch. Use piece of tape to hold it closed.
2
2.
Is setup switch SW1-1 in the ON position.
3
5
3.
Put setup switch SW1-1 in the OFF position.
4
4.
Go to the page number indicated in Index for the CLEANUP AND STARTUP
INSTRUCTIONS.
INDEX
5.
Is setup switch SW1-6 in the ON position.
6
7
6.
Put setup switch SW1-6 in the OFF position.
4
7.
Jiggle setup switches SW1-1 and SW1-6 back and forth. If status code 11 continues to flash
replace the variable speed furnace control
4
Status Code 12
BLOWER ON AFTER POWER UP - Blower will run for 90 seconds when furnace power is interrupted and later restored during
a call for heat (R-W/W1 closed) or if the call for heat is interrupted (R-W/W1 opens) during the blower on-delay period. If this
status code repeats every couple of minutes it is probably caused by a direct short in the pressure switch circuits, gas valve
GV, wiring to gas valve GV, or humidifier coil.
STEP ACTION YES
NO
GO
TO
1.
Remove the blower access panel and disconnect User Interface ABCD connector
(if used) or the R thermostat lead (if used) from the furnace control board.
2
2.
Depress the door switch. Use piece of tape to hold it closed.
3
3.
Jumper R and W/W1 thermostat terminals.
4
4.
Does the furnace keep repeating the following cycle?
Induced draft motor IDM runs, induced draft motor IDM stops, blower motor
BLWM runs for 90 seconds while AMBER LED status light flashes status code 12.
5 20
5.
Do you have less than 17-vac across R and C
OM
-24V on the variable speed furnace
control?
6 14
6.
Do you have less than 90-vac across L1 and NEUTRAL-L2 on the variable speed
furnace control?
7 10
7.
Make sure wire gage between main fuse box and furnace complies with wire size
specification in Installation, Start-Up, and Operating Instructions.
8
8. Fix
problem.
9
9.
Go to the page number indicated in Index for the CLEANUP AND STARTUP
INSTRUCTIONS.
INDEX
