Section 3. Maintenance; Introduction; Maintenance Hints; Humidity Sensor Calibration And Replacement - Henny Penny AHC-993 Technical Manual

3-1. INTRODUCTION

3-2. MAINTENANCE HINTS

3-3. HUMIDITY SENSOR
CALIBRATION AND
REPLACEMENT
Figure 3-1
Figure 3-2
Feb. 2011

SECTION 3. MAINTENANCE

This section provides procedures for the checkout and re-
placement of the various parts used within the merchandiser.
Before replacing any parts, refer to the Troubleshooting Sec-
tion. It will aid you in determining the cause of the malfunc-
tion.
1. You may want to use a multimeter to check the electric
components.
2. When the manual refers to the circuit being closed, the
multimeter should read zero unless otherwise noted.
3. When the manual refers to the circuit being open, the multi-
meter reads infinity.
The humidity sensor relays the cabinet humidity to the controls. If
it becomes faulty, "E-17", then "HUMIDITY SENSOR FAILED"
shows on the display. Replace sensor as follows:
To avoid electrical shock or property damage, move the
POWER switch to OFF and disconnect main circuit
breaker, or unplug cord at wall receptacle.
Replacement:
1. Open operator side door of unit.
2. Using a Phillip's head screwdriver, remove the front screw
and loosen the 2 side screws securing the sensor cover.
Slide cover towards you and over loosened screws.
Figure 3-1.
3. Using a 1-3/16" wrench, remove nut. Figure 3-2.
3-1
Model AHC-990/993