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Troubleshooting
14. Door Unlocking Function
NO
IS THE UNLOCK
DOOR LED ON
THE COMPUTER
FRONT PANEL
LIT?
YES
CHECK THE 1 AMP
DR FUSE AND
REPLACE IT AS
NEEDED.
TEST THE WATER LEVEL SWTCH AS FOLLOWS.
REPLACE THE WATER LEVEL SWITCH, AIR TRAP
AND/OR TUBING AS NEEDED.
A. CHECK THE AIR TRAP TUBING FOR LEAKS
AND/OR BLOCKAGE.
B. CHECK THE WATER LEVEL SWITCH WITH A
CONTINUITY TEST OR WITH AN OHMS TEST AT THE
FOLLOWING TERMINALS:
11 AND 12 (FOR LOW LEVEL)
21 AND 22 (FOR MEDIUM LEVEL)
31 AND 32 (FOR HIGH LEVEL)
THIS SHOULD BE A CLOSED CIRCUIT AT ALL THREE
POINTS THAT OPENS WITH AIR PRESSURE TO THE
SWITCH. BLOW INTO THE SWITCH TO PROVIDE AIR
PRESSURE. RELEASE THE AIR FROM THE SWITCH
AND MAKE SURE THAT ALL THREE LEVELS CLOSE.
NOTE: OPENING THE SWITCH WILL LIGHT THE LED
INPUT LEVEL INDICATORS ON THE DISPLAY.
5
1
3
4
2
IS THE
DR LIGHT ON
THE FUSEBOARD
BRIGHTLY LIT WITH
220 VOLTS PRESENT?
NOTE: THE LIGHT
MAY BE DIM UNTIL
THE BUTTON
IS PRESSED.
NO
IS THERE VOLTAGE (220
VOLTS) AT THE TWO
WIRES THAT GO TO THE
YA1 DOOR UNLOCK
SOLENOID (LOCATED
INSIDE OF THE DOOR BOX
AT THE 3 O'CLOCK
POSITION OF THE DOOR)?
CHECK THE YA1
FOR MECHANICAL
BINDINGS AND
REPLACE THE
SOLENOID AS
NEEDED.
CHECK FOR A CLOSED CIRCUIT ON
THE SB2 (THE WHITE MOMENTARY
DOOR UNLOCK PUSHBUTTON) WHEN
THE BUTTON IS PRESSED. IF THE
CIRCUIT ISN'T CLOSING, REPLACE
THE SB2.
YES
YES
NO
6
PHM1933S
