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PROBLEM
No display on panel.
Unit will not operate.
"NO RUN PERMISSIVE"
"LOW OIL DIFFERENTIAL"
FAULT
TROUBLESHOOTING
CAUSE
1. No 115VAC to 2T.
2. No 24VAC to Power Supply
Supply Board.
3. 2T defective, no
24VAC output.
4. No + 12V output (J2) from
Power Supply Board.
1. No chilled liquid flow.
2. Flow switch improperly
installed.
3. Defective flow switch.
4. Remote cycling device open.
5. "System" switch in the
OFF position.
1. Faulty oil or suction pressure
transducer or wiring
SOLUTION
1. Check wiring and fuses
(IFU and 2 FU).
Check emergency stop
contacts 5 to 1 of TB1
Terminal Block.
2. Check wiring 2T to
Power Supply Board.
3. Replace 2T
4. Replace Power Supply
Board or load on the board.
NOTE: Contact YORK
Service before
Replacing circuit Boards!
1. Check chilled liquid flow.
2. Check that the flow switch
is installed according to
manuafacturer's
instructions.
3. Replace flow switch.
4. Check cycling devices
connected to terminals
13 & 14 of the TB3
Terminal Block.
5. Place switches to the
ON position.
1. Check / replace
transducers or repair wiring.
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