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JOHNSON CONTROLS
132
FORM 150.63-NM6 (1020)
TROUBLESHOOTING
PROBLEM
CAUSE
SOLUTION
No display on panel.
1. No 115VAC to 1T.
1a. Check wiring and fuse
Unit will not operate.
3FU
b. Check wiring emergency
stop contacts 5 to L of CTB2
Terminal
Block.
c. Replace 1T
2. No 24VAC to Microboard
2. Check wiring 1T to
Microboard.
3. 1T defective, no
3. Replace 1T
24VAC output.
4. Short in wire to temp. sensors
4. Unplug connections at
or pressure transducers.
Microboard to isolate.
5. Defective Microboard
5. Replace Microboard.
or Display board.
NOTE: Contact YORK
Service
before
Replacing circuit Boards!
“FLOW SWITCH/REM
1. No air flow.
1. Check air flow.
STOP NO RUN PERMISSIVE”
2. Air flow switch improperly
2. Check that the air flow switch
installed.
is installed according to
manufacturer’s
instructions.
3. Defective air flow switch.
3. Replace air flow switch.
4. Remote cycling device open.
4. Check cycling devices
connected to terminals
13 and 14 of the CTB1
Terminal
Block.
“LOW SUCTION PRESSURE”
1. Improper suction pressure
1. Adjust per recommended
FAULT
cutouts adjustments.
settings.
2. Low refrigerant charge.
2. Repair leak if necessary
and add refrigerant.
3. Fouled filter dryer.
3. Change dryer/core.
TABLE 38 –
TROUBLESHOOTING
CONT’D
Service and Troubleshooting
Summary of Contents for YCUL0045
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