A.O. Smith 101 Series Service Handbook

Servicing should only be performed by a Qualified Service Agent
77
TROUBLESHOOTING
Fault & Alert Messages
DISPLAYED MESSAGE
CONDITION/INDICATES
CHECK/REPAIR
“Temp Probe Open”
(Fault Condition)
The control system has detected an open circuit
from the temperature sensor. The control system will
declare this Fault condition if it senses a resistance
above 56,000 ohms from the temperature sensor.
Possible Causes:
Plug/socket connection problems
Wiring connection problems
Defective Immersion Temperature Probe
• Check the J5 plug/socket connections at the
CCB ensure they are mating properly and pro-
viding good contact. Check the pins inside the
J5 plug/socket for wear or damage. See CCB
illustration and socket identification on pages 50
- 52. Replace damaged plug connectors/wiring
harness as necessary.
• Check for pinched or broken wiring between the
Immersion Temperature Probe and the J5 plug/
socket connection on the CCB - repair or
replace damaged wiring as necessary. See
CCB illustration and socket identification on
pages 50 - 52.
• Check the resistance of the temperature sensor
inside the Immersion Temperature Probe - see
pages 43 - 45. Replace the Immersion Temper-
ature Probe if measured resistance is above
56,000 ohms.
• Call the toll free technical support phone num-
ber on the back cover of this manual for further
assistance if the problem has not been cor-
rected after performing the procedures outlined
here.
“Temp Probe Short”
(Fault Condition)
The control system has detected a shorted circuit in
the temperature sensor. The control system will
declare this Fault condition if it senses a resistance
below 390 ohms from the temperature sensor.
Possible Causes:
Shorted wiring
Defective Immersion Temperature Probe
• Check for pinched or shorted wires between the
J5 plug/socket connection on the CCB and the
Immersion Temperature Probe - repair or
replace damaged wiring as necessary. See
CCB illustration and socket identification on
pages 50 - 52.
• Check the resistance of the temperature sensor
inside the Immersion Temperature Probe - see
pages 43 - 45. Replace the Immersion Temper-
ature Probe if measured resistance is below 390
ohms.
• Call the toll free technical support phone num-
ber on the back cover of this manual for further
assistance if the problem has not been cor-
rected after performing the procedures outlined
here.

A.O. Smith 101 Series Specifications

General

Brand	A.O. Smith
Model	101 Series
Category	Water Heater
Language	English