OPERA
TION
AND SER
VICE
Water Level Sensor Troubleshooting Steps
WARNING: Electrocution Hazard.
This test should be done when current is not present on pins. Always unplug the humidifier
before testing.
Test Setup
• Remove and drain the tank. The tank must be
empty.
• Remove the connector from the water level sensor.
Test Pins
Test is done in 5 pins as shown in the figure below.
Testing for Shorts
• Use an OHM METER and set it to the highest
setting.
• Place the OHM METER PROBES on top of sensor
probes.
• Measure the resistance between the following
locations:
Between P1 and P3
Between P1 and P4
Between P2 and P4
Between P4 and P5
Good Water Sensor
The water sensor is good if all pins show an infinite
reading.
Bad Water Sensor
The water sensor is bad if any pins show Ohms
reading. This water sensor should be replaced.
Steam Humidifier System 69-2285—09
48
M32994
P1
P2
P3
WATER LEVEL
SENSOR
P4
P5