JOHNSON CONTROLS
137
FORM 150.62-NM8 (1020)
4
TROUBLESHOOTING CHARTS
TABLE 40 – TROUBLESHOOTING
PROBLEM
CAUSE
SOLUTION
NO DISPLAY ON PANEL
UNIT WILL NOT OPERATE
1. No 115VAC to 1T.
1a. Check wiring and fuse 3FU
1b. Check wiring emergency
stop contacts 5 to L of CTB2
terminal block.
1c. Replace 1T.
2. No 24VAC to I/O Board.
2. Check wiring 1T to I/O Board.
3. 1T defective, no 24VAC output.
3. Replace 1T.
4. Short in wire to temp. sensors or
pressure transducers.
4. Unplug connections at I/O Board
to isolate.
5. Defective I/O & IPU2 board or Display
board
5. Replace I/O Board & IPU2
board.
NOTE:
Contact Johnson Controls
Service before replacing circuit
boards.
FLOW SWITCH/REM
STOP NO RUN PERMISSIVE
1. No chilled liquid flow.
1. Check chilled liquid flow.
2. Flow switch improperly installed.
2. Check that the flow switch
is installed according to
manufacturer’s instructions.
3. Defective flow switch.
3. Replace 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 FAULT
1. Improper Suction Pressure Cutouts
adjustments.
1. Adjust per recommended
settings.
2. Low refrigerant charge.
2. Repair leak if necessary and add
refrigerant.
3. Fouled filter dryer.
3. Change dryer/core.
4. TXV / EEV defective.
4. Replace TXV/EEV.
5. Reduced flow of chilled liquid through
the cooler.
5. Check GPM
(See
Operational
Limitations in Installation
section).
Check operation of
pump, clean pump strainer,
purge chilled liquid system of air.
6. Defective suction pressure transducer/
low pressure switch or wiring.
6. Replace transducer/low pressure
switch or faulty wiring.
Refer to
Service section for pressure/
voltage formula.
7. LLSV defective
7. Replace LLSV
8. EEV Unit Setup in TXV mode.
8. Place in Service Mode &
program for EEV.
Summary of Contents for YCAL0014E Series
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