- 14 -
SECONDARY VOLTAGE FUSE IS OPEN
STEP
ACTION
YES
NO
GO TO
1.
Turn power off and remove the blower door.
2
2.
Is secondary voltage fuse blown? Check continuity to make sure.
5
3
3.
Replace modulating furnace control.
4
4.
Replace secondary voltage fuse if necessary then go to page number indicated in Index for
CLEANUP AND START-UP INSTRUCTIONS.
INDEX
5.
Disconnect the communication connector PL7 (if used), or all thermostat leads (if used) from
the modulating furnace control (including all wires connected to the HUM terminal) and
replace secondary voltage fuse.
6
6.
Turn power on and depress door switch. Use a piece of tape to hold switch closed.
7
7.
Does the AMBER LED alternately flash bright-dim-bright-dim like a heartbeat?
12
8
8.
Turn power off and disconnect PL1 from modulating furnace control.
9
9.
Do you have continuity between either RED wire connected to the limit circuit and chassis
ground?
10
41
10.
You have a short circuit in the limit switch circuit. This includes limit switch LS, and both
flame roll-out switches FRS.
11
11.
Fix problem.
4
12.
Disconnect the pressure tube from the collector box and jumper R and W/W1 thermostat
terminals.
13
13.
Does the AMBER LED turn off when W/W1 is energized?
14
20
14.
Turn power off and disconnect PL1 from modulating furnace control.
15
15.
Do you have continuity between the YELLOW wire connected to the low pressure switch
LPS and chassis ground?
16
39
16.
You have a short circuit in the YELLOW wire to the low pressure switch LPS.
11
17.
Does the AMBER LED turn off when the HUM terminal is energized?
Note:
On the modulating furnace control the HUM terminal is energized when the blower
turns ON.
3
18
18.
Disconnect jumper wire across R and W/W1 thermostat terminals and wait until blower
stops.
19
19.
Jumper R, W/W1, and W2 thermostat terminals.
44
20.
Disconnect jumper wire across R and W/W1 thermostat terminals and wait until inducer
stops.
21
21.
Reconnect the pressure tube from the pressure switch assembly back to the collector box.
22
22.
Jumper R and W/W1 thermostat terminals.
23
23.
Does the AMBER LED turn off before the hot surface igniter HSI is energized?
24
33
24.
Turn power off and disconnect PL1 from modulating furnace control.
25
25.
Do you have continuity between the ORANGE wire connected to the low pressure switch
LPS and chassis ground?
26
27
26.
The ORANGE wire from low pressure switch LPS is shorting to ground. Replace or repair
it.
11
27.
Do you have continuity between the VIOLET wire connected to the medium pressure switch
MPS and chassis ground?
28
29
28.
The VIOLET wire from medium pressure switch MPS is shorting to ground. Replace or
repair it.
11
29.
Disconnect jumper wire across R and W/W1 thermostat terminals, reconnect PL1 to the
modulating furnace control, disconnect PL17 from modulating gas valve, and replace
secondary voltage fuse.
30
30.
Turn power on and depress door switch. Use a piece of tape to hold switch closed.
31
31.
Jumper R and W/W1 thermostat terminals.
32
32.
Does status code 3 + 5 flash?
60
3
33.
Does the AMBER LED turn off when the gas valve GV is energized?
34
17
34.
Disconnect jumper wire across R and W/W1 thermostat terminals and replace secondary
voltage fuse.
35
35.
Put gas valve manual ON/OFF switch in the OFF position and jumper R and W/W1
thermostat terminals.
36
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...
