Nordyne R-410A user manual Short Cycling Thermostat demand signal is intermittent

Page 18

TROUBLESHOOTING - CONTINUED

Status LED

Status LED

 

Status LED Troubleshooting Information

Description

 

 

 

 

 

 

 

 

 

Short Cycling

Thermostat demand signal is intermittent

Yellow “ALERT”

/ Compressor

Low line voltage (contact utility if voltage at disconnect is low)

Flash Code 3

is running only

Excessive liquid refrigerant in compressor

 

briefl y

Compressor bearings are seized

 

 

 

 

 

 

Run capacitor has failed

 

 

Low line voltage (contact utitlity if voltage at disconnect is

Yellow “ALERT”

 

 

low)

Locked Rotor

Check wiring connections

Flash Code 4

 

Excessive liquid refrigerant in compressor

 

 

 

 

Compressor bearings are seized

 

 

Measure compressor oil level

 

 

 

 

 

 

Outdoor unit power disconnect is open

 

 

Compressor circuit breaker or fuse(s) is open

 

 

Compressor contactor has failed open

 

 

 

Check compressor contactor wiring and connectors

 

 

 

Check for compressor contactor failure (burned, pitted

 

 

 

or open)

Yellow “ALERT”

 

 

Check wiring and connectors between supply and

Open Circuit

 

compressor

Flash Code 5

 

 

 

Check for low pilot voltage at compressor contactor coil

 

 

 

 

 

 

High pressure switch is open and requires manual reset

 

 

Open circuit in compressor supply wiring or connections

 

 

Unusually long compressor protector reset time due to extreme

 

 

 

ambient temperature

 

 

Compressor windings are damaged

 

 

 

Check compressor motor winding resistance

 

 

 

 

 

 

Run capacitor has failed

 

Open Start Circuit

Open circuit in compressor start wiring or connections

Yellow “ALERT”

 

Check wiring and connectors between supply and the

Current only in

 

Flash Code 6

 

compressor S terminal

run circuit

 

 

Compressor start winding is damaged

 

 

 

 

 

Check compressor motor winding resistance

 

 

 

 

 

 

Open circuit in compressor run wiring or connections

Yellow “ALERT”

Open run circuit

 

Check wiring and connectors between supply and the

Current only in

 

compressor R terminal

Flash Code 7

 

start circuit

Compressor run winding is damaged

 

 

 

 

Check compressor motor winding resistance

 

 

 

 

Yellow “ALERT”

Welded Contactor

Compressor contactor has failed closed

Compressor

Flash Code 8

Thermostat demand signal not connected to module

always runs

 

 

 

 

 

 

 

Yellow “ALERT”

Low Voltage

Control circuit transformer is overloaded

Control circuit

Low line voltage (contact utility if voltage at disconnect is low)

Flash Code 9

< 17VAC

Check wiring connections

 

 

 

 

 

* Flash code number corresponds to a number of LED fl ashes, followed by a pause and then repeated. Trip and alert LED’s fl ashing at same time means control circuit voltage is too low for operation.

Table 4. LED Diagnostics - Continued

18

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Contents User’s Manual / Installation Instructions Page User Information Safety Information About the Heat PumpOperating Instructions System Maintenance TroubleshootingWarranty Information Labels, Tags, and Precautions Pressures within the SystemBrazing Operations General Information Installing the Indoor UnitInstalling the Outdoor Unit Site PreparationElectrical Connections Low-Pressure Switch Control Circuit WiringCopper Wire Size Grounding High-Pressure SwitchComfort AlertTM Diagnostics Module VAC Power WiringStartup and Adjustments Functional CheckoutsDefrost Test Procedure Diagnostic Description LED StatusControl Diagnostic Indoor BlowerAnti Short Cycle Timer Test Adjustment of Refrigerant ChargeCooling Charging Charts 450 425 400 375 350 325 300 275 Heating Charging Chart LED Diagnostics LEDShort Cycling Thermostat demand signal is intermittent Module Wiring Troubleshooting LED¢708868b¤
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R-410A specifications

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