SERVICING
57
is 4 seconds.
®
1. Check for 120 volts from Line 1 (Hot) to Line 2 (Neutral)
at the ignition control. No voltage, check the door switch
connections and wire harness for continuity.
2. Check for 24 volts from W to C terminal on the ignition
control. No voltage. Check transformer, room thermostat,
and wiring.
approximately 13 volts on the terminal board between (C)
and (R), check for blown fuse.
3. Check 120 volt outputs on the 5 pin harness.
Pin 1 = HSI Hot
Pin 2 = Inducer High
Pin 3 = Inducer Low
Pin 4 = Inducer N
Pin 5 = HSI N
R783
R
782
R781
R784
E13
T1
E190
T2
E8
T4
E9
T3
R94
R95
R96
R97
K11
K2 K1
K3
R
V
2
G
L
2
GL 1
E39
W3 2
W4 0
R5 8
W11
R7 5
R118
W3 6
W3 7
W5 3
Q7 2
M2
Q7 1
Q7 0
Q3
Q6
Q2
Q7
Q5
Q6 0
Q4
Q14
Q10
Q11
Q13
Q9
W4 6
W12
W14
W4 9
W5 2
W2 4
W5 1
W3 3
W2 0
R7 8
W3 1
R2 0 1
R588
R5 9
R780
R524
R3
R584
R586
R4
R15
R7 6
R7 1
W3 5
W3 0
W13
W1
CR13
R566
R8 7
R3 1
R9
R580
R568
R578
R7 0
R5 3
W15
W3
W7
W18
W3 4
W19
W2 9
W16
W2
W10
W4 4
R553
W2 2
R9 1
R8 2
W4
S2
F1
DS1
S1
R
R8 1
R2 0 2
R119
R557
R570
R573
R564
R581
C11
R6 3
R3 8
R8 5
E35
E36
R2
R3 3
R7 4
R7 3
R2 1
R4 4
R5 4
R6 5
R13 0
R2 7
R2 9
R4 1
R2 0 0
R7 7
R563
R562
R10
R115
R4 0
R5 0
R3 9
R4 9
R2 0 4
R3 5
RV 4
RV 3
C13
C6 0
C14
C15
R93
R89
R17
R16
R12
R11
R6 1
R13
R18
R7 9
E29
CIRC- H
E
28
HUM
E16
XFMR
E15
L1
E10
EAC- H
E21
E2
0
E1
8
E17
E19
K
8
K9
K5
K6
K4
E40
E12
U3
S W3
2
3
4
E2
E6
C
E5
G
E4
R
E3
W1
E31
Y
E32
TWIN
OF F ON
E26 E27
1
2
3
4
3
2
1
ST5
ST1
ST2
ST6
ST4
ST3
ERROR
LAST
STATUS
+
(1VDC=1uA)
CURRENT
F L AME
CAUT I ON - 12 0V
NEUT RAL S
R6 0
K10
Yl 0
Y
W1
W2 R
G C T WI N
E22
OF F
ON
W3 9
E14
R88
R9 2
59- 5043 REV. D
I
GN
SYS
TEM
24V
AC
60H
z. 0
.5A
MA
X
4. After the ignitor warmup time, begin checking for 24 volts
to the gas valve. Voltage will be present for four seconds
to the air circulation blower following the heat on delay
period.
present the control will de-energize the gas valve and “retry”
for ignition or lockout.
G
TG
T
R BR RG R
TG T T
T R R
B RT
R T RRT
G R JR R T
Flame current can be measured in two ways:
rod
2. Putting a D.C. volt meter across the two solder pads in
1 D.C. volt = 1 microamp.
TG RT
is established, the hot surface ignitor will be de-energized.
4. The Integrated Ignition controls will have 1 to 4 micro-
amps. If the micro-amp reading is less than the minimum
sensor to burner gap, dirty flame sensor, or poor
grounding.
5. If absolutely no reading, check for continuity on all
components and if good - replace ignition control module.
Contaminated fuel or combustion air can create a
steel wool.
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