White Rodgers 1F98EZ-1621 Specifications download pdf (Page 12)

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www.emersonclimate.com

White-Rodgers is a division

of Emerson Electric Co.

The Emerson logo is a

trademark and service mark

of Emerson Electric Co.















7

Status LED

Description Comments

 Module has power Supply voltage is present at module terminals

 Comfort Interface en-

ergizing “Y” terminal

to call for cool but the

compressor is not run-

ning

1. Compressor protector is open. Check high head pressure and compressor supply

voltage.

2. Check for open unit power disconnect, circuit breaker or fuses, low pressure switch

if present in system or Compressor contact or has failed open.

3. Broken wire or connector not making contact.



1

Long Run Time

Compressor is running

extremely long run

cycles

1. Low refrigerant charge.

2. Evaporator blower is not running. Check blower relay, blower motor capacitor,

motor failure or blockage, wiring and connectors, blower control board, Comfort

Interface wiring for open circuit.

3. Evaporator coil is frozen. Check for low suction pressure, low Comfort Interface



4.

5. Check Comfort Interface sub-base or wiring for short circuit, Comfort Interface

installation (location, level)

6. Faulty TXV (Thermostatic Expansion Valve). Check TXV bulb installation (size,





2

System Pressure Trip

Discharge or suction

pressure out of limits or

compressor overloaded

1. High head pressure. Check high pressure switch if present in system, overcharge

with refrigerant, non-condensable in system.

2. Condenser coil poor air circulation (dirty, blocked, damaged)

3. Condenser fan not running. Check fan capacitor, wiring and connectors, motor for

failure or blockage.

4. Return air duct has substantial leakage

5. If low pressure switch present in system, check Flash Code 1 information.



3

Short Cycling

Compressor is running



1. Comfort Interface demand signal is intermittent

2. Time delay or control board defective

3. If high pressure switch present go to Flash Code 2 information

4. If low pressure switch present go to Flash Code 1 information



4

Locked Rotor

1. Run capacitor has failed.

2. Low line voltage (contact utility if voltage at disconnect is low) check wiring.

3. Excessive liquid refrigerant in compressor. Compressor bearings are seized,

measure compressor oil level.



5

Open Circuit

1. Open Outdoor unit power disconnect, circuit breaker, fuse(s). Compressor

contactor failed to open. Check wiring on compressor contactor and between

supply and compressor, contactor failure (burned, pitted), low pilot voltage at

compressor contactor coil.

2. High pressure switch is open and requires manual reset.

3. Unusually long compressor protector reset time due to extreme ambient

temperature.

4. Compressor windings are damaged. Check compressor motor winding resistance.



 6

Open Start Circuit

Current only in run

circuit

1. Run capacitor has failed.

2. Open circuit in compressor start wiring or connections. Check wiring and

connectors between supply and the compressor “S” terminal.

3. Compressor start winding is damaged. Check compressor motor winding resistance.



7

Open Run Circuit

Current only in start

circuit

1. Open circuit in compressor run wiring or connections. Check wiring and connectors

between supply and the compressor “R” terminal.

2. Compressor run winding is damaged. Check compressor motor winding resistance.



 8

Welded Contactor

Compressor always runs

1. Compressor contactor has failed closed

2. Comfort Interface demand signal not connected to module



9

Low Voltage Control

Circuit < 17 VAC

1. Control circuit transformer is overloaded

2. Low line voltage (contact utility if voltage at disconnect is low). Check wiring

connections







Control circuit voltage

too low for operation



TROUBLESHOOTING

Note: This is only applicable for systems featuring  (or similar) technology.

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White Rodgers 1F98EZ-1621 Specifications Page 12

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