Energy Tech Laboratories DSH - Manual (Page 19)

FORM 145.32-IOM1 (908)
19
JOHNSON CONTROLS
Status LED Status LED Description Status LED Troubleshooting Information
Green “POWER” Module has power Supply voltage is present at module terminals
1. Compressor protector is open
2. Condensing unit power disconnect is open
3. Compressor circuit breaker or fuse(s) is open
4. Broken supply wires or connector is not making contact
5. Compressor power wires not routed
through Comfort Alert
6. Compressor contactor has failed open
Red “TRIP” LED
Flashing
1. Compressor contactor coil shorted.
2. Electrical load too high for PROT circuit
(maximum 1 Amp)
3. 24 VAC wired directly to PROT terminal
1. High head pressure
2. Condenser coil poor air circulation (dirty,
blocked, damaged)
3. Condenser fan is not running
4. If low pressure switch is open:
Refer to Code 3 for troubleshooting
1. If low pressure switch is open:
a. Low refrigerant charge
b. Evaporator blower is not running
c. Evaporator coil is frozen
d. Faulty metering device
e. Condenser coil is dirty
f. Liquid line restriction (?lter drier
blocked if present)
2. If high pressure switch is open, go to
Flash Code 2 information
3. Intermittent thermostat demand signal
4. System or control board defective
Yellow “ALERT”
Flash Code 3
Short Cycling
Compressor is running only
brie?y LOCKOUT
Red “TRIP” LED
On Solid
Thermostat demand signal Y
is present, but the
compressor is not running
Yellow “ALERT”
Flash Code 2
System Pressure Trip
Discharge pressure out of
limits or compressor over-
loaded (if no high pressure
switch in system)
LOCKOUT
The anti-short cycle timer (3 minutes), in module is preventing compressor restart.
Module locks out compressor when compressor damaging ALERT codes appear.
Lockout ALERT codes are noted in the Status LED Description.
During a compressor lock out, 24VAC power must be removed from module to manually reset
A short circuit or over current
condition exists on PROT
terminal.
Yellow "ALERT"
LED On Solid
briefly
(filter drier