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SERVICE PROCEDURE PDV24-I
Thermostat Circuit Testing
CAUTION
Be Careful When Making Voltage
Measurements or Jumping Terminals
Not to Damage or Deform Connectors or
Connector Pins.
DANGER
120 volt exposure. To avoid personal injury,
use caution while performing this procedure.
WARNING
Do not reset the display from the hard lockout
state without correcting the cause of the
overheating condition
Check continuity of wire harness to affected sensor. Measurement
of ohmeter should be close to 0 ohms. Replace wire harness if high
resistance is measured (over 0.5 ohms) Check wires for intermittent
connections, shorts, frayed insulation. Replace if necessary
Turn power on to water heater.
Run water heater through heating cycle and verify proper operation.
Sensor temperature can be viewed when burner shuts off (see
section on viewing the display in “Service Mode”.
Turn power “OFF”.
Draw water to cool tank below 120 deg. F
Check lower sensor. Is the sensor fully inserted into the well?
Sensor is held in place with a clip fastened to the well (see photo )
Check lower sensor wire making sure it is not damaged or has
breaks in the wire insulation. Check upper harness wires to upper
sensor, if used (some models).
If sensor clip is damaged
replace clip. Replace lower
sensor if damaged.
Check Sensor Resistance
(See Sensor Resistance
Testing, following section)
Y
N
Measuring upper
sensor resistance
through wire
harness
(disconnected at
control board).
Checking
continuity of
upper sensor wire
harness.
Removing lower
sensor from well.
Held in place by a
clip fastened to
well shoulder.
Condition: Water Heater Not Operating
Display shows error code “65”
High Water Temperature (over 200 deg. F)
If wire harness checks out O.K., check sensor resistance detailed in
the section for testing sensor resistance. Replace the upper or
lower sensor as indicated by error code number.
Unplug or disconnect electrical power to the water heater
Condition: Water Heater Not Operating
Display shows error code “31” (Upper Sensor
Readings Faulty) or error code “32” (Lower Sensor
Readings Faulty)
See next page
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