whl-648 Rev. 001 Rel. 003 Date 10.8.19
57
Table 32 - Diagnostics and Suggested Corrective Actions
Display
Condition
Diagnostic
Possible Corrective Actions
Nothing appears on
the display control
panel and no other
boiler components are
operating
Control is not
receiving 120V
power
Ensure service switch and/or circuit
breaker to boiler is turned ON
Turn on service switch or circuit breaker to
power boiler
Is there 120V at the service switch
Troubleshoot and correct the power supply to
the manual switch
Is the ON/OFF switch inside the boiler
cabinet is turned on
Turn ON the manual power switch inside the
boiler cabinet
Check for 120V at the line voltage terminal
block located inside the boiler cabinet
Correct wiring inside the boiler cabinet using
the wiring diagram in the installation manual
Inspect the fuse. Replace as necessary
Replace the fuse with the proper part found in
the replacement part section of this manual. If
fuse blows again, recheck the wiring per dia-
gram
Nothing appears on
the display control
panel, but the boiler is
operating
Occurs when
communication
is lost from the
control to the
display
Check for loose connections and proper
pin alignment / engagement on the
control’s plug
Check for continuity on the wire harness from
the display to the control. See repair parts sec-
tion for proper replacement part.
Cycle power off and on using boiler power
switch and check for operation
Replace with new display module. See repair
parts section for proper replacement part.
Display repeatedly goes
through initialization
sequence
Occurs when
control does not
receive signal
from fan
Cycle power off and on using boiler power
switch and check for operation
Replace fan
CH Return Temperature Sensor (7855P-097)
Exhaust Temperature Sensor (7850P-070)
Storage Tank Temperature Sensor (7855P-057)
CH Supply Temperature Sensor (7855P-030)
DHW Temperature Sensor (7855P-094)
Outdoor Temperature Sensor
(7855P-084)
Temperature (
o
F)
Resistance (Ω)
Temperature (
o
F)
Resistance (Ω)
Temperature (
o
F)
Resistance (Ω)
-4
62162
-4
28409
-4
99200
5
48440
5
22152
5
74229
14
38045
14
17408
14
56090
23
30107
23
13782
23
42790
32
23998
32
10990
32
32930
41
19261
41
8824
41
25550
50
15562
50
7131
50
19990
59
12655
59
5800
59
15760
68
10353
68
4747
68
12510
77
8520
77
3906
77
10000
86
7051
86
3233
86
8050
95
5867
95
2690
95
6520
104
4908
104
2250
104
5310
113
4125
113
1891
113
4350
122
3485
122
1598
122
3590
131
2957
131
1356
140
2520
140
1155
149
2157
149
989
158
1854
158
850
167
1600
167
733
176
1386
176
635
185
1205
185
552
194
1051
194
482
203
920
203
421
212
808
212
370
Table 33 - Temperature Sensor Resistance
Содержание WBRC 140 Series
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Страница 40: ...whl 648 Rev 001 Rel 003 Date 10 8 19 40 Figure 33 Electrical Wiring Diagram ...
Страница 41: ...whl 648 Rev 001 Rel 003 Date 10 8 19 41 Figure 34 Ladder Diagram ...
Страница 81: ...whl 648 Rev 001 Rel 003 Date 10 8 19 81 Notes ...
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