Westinghouse WBRC 140 Series Installation, Start-Up, Maintenance, Parts, Warranty page 57

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