Filter
Top Products
ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
Technical Literature Department 44 of 52 Ashland City, TN © 2008
Servicing should only be performed by a Qualified Service Agent
FAULT MESSAGES (CONT)
DISPLAYED MESSAGE
CONDITION/INDICATES
CHECK/REPAIR
“Upper Probe Short”
The control system has detected less than 390
ohms from the Temperature Probe on top of the
water heater.
• Check all wiring between the Temperature
Probe and the J7 Socket on the CCB (page 36).
Repair/replace anything worn or damaged.
• Unplug J7 plug from CCB, check resistance
between the two black wires in the plug end with
an ohm meter. If resistance is at or below 390
ohms - replace the Temperature Probe.
• Call the technical support phone number shown
on the water heater labeling for further assis-
tance if the problem has not been corrected
after performing the procedures outlined here.
“Flame Probe Short”
The control system has detected that the flame
sensor is grounded.
• Disconnect the wire from the flame sensor (see
pages 12 and 24). Check for continuity between
flame sensor and ground with an ohm meter.
There should be no continuity - infinite resis-
tance.
• If above test indicates there is continuity
between the flame sensor and ground - remove
the flame sensor (see pages 12 and 24). Ensure
the flame sensor is not bent and touching the
burner.
• Check all flame sensor wiring between the
flame sensor and the J4 male spade connector
on the CCB (page 36). Ensure there are not any
pinched wires or shorts - repair/replace anything
worn or damaged.
• Replace the flame sensor.
• Call the technical support phone number shown
on the water heater labeling for further assis-
tance if the problem has not been corrected
after performing the procedures outlined here.