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TABLE 35 – TROUBLESHOOTING
PROBLEM
No display on panel.
Unit will not operate.
"FLOW SWITCH/REM
STOP NO RUN PERMISSIVE"
"LOW SUCTION PRESSURE"
FAULT
YORK INTERNATIONAL
TROUBLESHOOTING
CAUSE
1. No 115VAC to 1T.
2. No 24VAC to Microboard
3. 1T defective, no
24VAC output.
4. Short in wire to temp. sensors
or pressure transducers.
5. Defective Microboard
or Display board.
1. No air flow.
2. Air flow switch improperly
installed.
3. Defective air flow switch.
4. Remote cycling device open.
1. Improper suction pressure
cut-outs adjustments.
2. Low refrigerant charge.
3. Fouled filter dryer.
FORM 150.63-NM2
SOLUTION
1a. Check wiring and fuse
3FU
b. Check wiring emergency
stop contacts 5 to L of CTB2
Terminal Block.
c. Replace 1T
2. Check wiring 1T to
Microboard.
3. Replace 1T
4. Unplug connections at
Microboard to isolate.
5. Replace Microboard.
NOTE: Contact YORK
Service before
Replacing circuit Boards!
1. Check air flow.
2. Check that the air flow switch
is installed according to
manufacturer's
instructions.
3. Replace air flow switch.
4. Check cycling devices
connected to terminals
13 & 14 of the CTB1
Terminal Block.
1. Adjust per recommended
settings.
2. Repair leak if necessary
and add refrigerant.
3. Change dryer/core.
CONT'D
4
139
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