- 28 -
Status Code 1 + 2
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 door and disconnect communication connector PL7 (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 1 + 2.
5
20
5.
Do you have less than 17-vac across R and C
OM
-24V on the modulating furnace control?
6
14
6.
Do you have less than 90-vac across L1 and L2 on the modulating 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
10.
Disconnect the R thermostat lead.
11
11.
Do you have less than 19-vac across R and C
OM
-24V on the modulating furnace control?
12
13
12.
Replace transformer.
9
13.
The thermostat and/or thermostat wires are loading down the transformer. Replace the
thermostat or repair thermostat wires.
9
14.
Does the hot surface igniter HSI come on during the cycle?
15
24
15.
Disconnect the humidifier lead from HUM terminal on modulating furnace control.
16
16.
Does the furnace still alternately cycle induced draft motor IDM and blower motor BLWM as
described in Step 4.
18
17
17.
The humidifier may not be wired into the system properly or there is a direct short in wiring
to humidifier solenoid coil, diode bridge(if used), or humidifier solenoid coil.
8
18.
The gas valve GV is miswired, there is a short in the gas valve GV, or there is a short in the
wiring to the gas valve GV. Refer to Appendix E to check gas valve GV.
8
19.
There is a direct short in the ORANGE wire from the low pressure switch LPS.
8
20.
While the unit is operating in minimum heat jumper R and W2 thermostat terminals.
21
21.
Does the furnace abruptly shut down with no inducer post purge and then run blower motor
BLWM for 90 seconds while AMBER LED status light flashes status code 1 + 2.
22
23
22.
There is a direct short in the BROWN wire from the high pressure switch HPS.
8
23.
The call for heat was probably satisfied during the blower on-delay period, or power to the
furnace was probably interrupted during a call for heat. This is normal operation. Go to the
page number indicated in Index for the CLEANUP AND STARTUP INSTRUCTIONS.
INDEX
24.
Disconnect VIOLET wire from the medium pressure switch MPS.
25
25.
Does the furnace still alternately cycle induced draft motor IDM and blower motor BLWM as
described in Step 4.
19
26
26.
There is a direct short in the VIOLET wire from the medium pressure switch MPS.
8
Status Code 1 + 5
BLOWER MOTOR LOCKOUT - This status code indicates the blower failed to reach 250 RPM or the blower failed to
communicate to the modulating furnace control within 30 seconds after being turned ON in two successive heating cycles.
Control will auto reset after 3 hours. Refer to status code 4 + 1.
440 08 4001 00
Содержание 9MAC/E series
Страница 39: ...39 Fig 2 Wiring Schematic 440 08 4001 00...
Страница 41: ...41 Figure 3 ECM Blower Motor 440 08 4001 00...
Страница 48: ...48 Replaces New Form ICP Eng 3 12 440 08 4001 00...
