2. If high pressure switch is open, go to Flash Code 2 information
3. Intermittent thermostat demand signal
4. System or control board defective
The anti-short cycle timer (3 minutes), in module is preventing compressor restart.

 

 

 

 

FORM 145.32-IOM1 (908)

 

 

 

 

 

 

 

 

 

 

 

 

Status LED

Status LED Description

 

Status LED Troubleshooting Information

Green “POWER”

Module has power

Supply voltage is present at module terminals

 

 

 

 

Red “TRIP” LED

Thermostat demand signal Y

1.

Compressor protector is open

 

On Solid

is present, but the

 

 

 

 

 

compressor is not running

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

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

Yellow "ALERT"

A short circuit or over current

1.

Compressor contactor coil shorted.

 

LED On Solid

condition exists on PROT

 

 

 

 

 

terminal.

 

 

 

 

 

2.

Electrical load too high for PROT circuit

 

 

 

 

 

 

 

(maximum 1 Amp)

 

 

 

 

 

 

 

 

 

3.

24 VAC wired directly to PROT terminal

 

 

 

 

 

 

Yellow “ALERT”

System Pressure Trip

1.

High head pressure

 

Flash Code 2

Discharge pressure out of

 

 

 

 

 

limits or compressor over-

2.

Condenser coil poor air circulation (dirty,

 

 

loaded (if no high pressure

 

blocked, damaged)

 

 

switch in system)

3.

Condenser fan is not running

 

 

LOCKOUT

 

 

 

 

 

 

4.

If low pressure switch is open:

 

 

 

 

Refer to Code 3 for troubleshooting

Yellow “ALERT”

Short Cycling

1.

If low pressure switch is open:

 

Flash Code 3

Compressor is running only

a. Low refrigerant charge

 

 

briefly?y LOCKOUT

b. Evaporator blower is not running

 

 

 

c. Evaporator coil is frozen

 

 

 

d. Faulty metering device

 

 

 

e. Condenser coil is dirty

 

 

 

 

f. Liquid line restriction (filter(?drier

 

 

 

 

blocked if present)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Johnson Controls

19

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Energy Tech Laboratories DSH installation instructions Status LED Troubleshooting Information

DSH specifications

Energy Tech Laboratories DSH is a pioneering organization at the forefront of energy technology innovation. With a commitment to sustainability and efficiency, DSH focuses on developing cutting-edge solutions that address modern energy challenges. The laboratory excels in research and development, primarily emphasizing renewable energy, energy storage systems, and smart grid technologies.

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