Friedrich 2003 service manual Troubleshooting Heating Cooling/Electric Models

Page 43

Troubleshooting: Heating (Cooling/Electric Models)

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

Heater relay or contactor coil open.

Check continuity of coil.

Fan Operates –

Heater relay or contactor stuck open,

Inspect, test continuity with ohmmeter.

pitted or burned.

 

heating element does

High limit control open.

Check continuity – if open, replace.

not come on.

Open thermal fuse.

Check continuity. Check reason for failure.

 

Open or shorted element.

Check voltage across heater terminals. Check

 

 

amperage draw of heater.

 

Loose connections.

Tighten all terminals.

 

 

 

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

Restricted filter.

Clean as recommended in Owner’s Manual.

Heating inadequate.

Cycling high limit control.

Control is set to open at 155°F ± 5°F and close at

 

130°F ± 8°F. If cycling prematurely, replace control.

 

 

 

 

Exhaust or fresh air door open.

Check position of fresh air door control slide. Adjust

 

 

cable if door does not close properly.

 

 

 

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

Fan relay contacts open.

Check continuity of fan relay. NOTE: Some models

Fan operates in "Con-

 

have the fan relay energized during the heating

stant" position, but not in

 

cycle while others do not.

"Automatic" (Money-

Inoperative system switch.

Check continuity between terminals "L2" and "3" of

Saver).

 

the system switch.

 

Loose connection.

Check connections on system switch and fan relay.

 

 

 

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

Heat anticipator (resistor) shorted.

Disconnect power to unit. Remove resistor from

Long "off" and "on"

 

thermostat bulb block. Plug in unit and allow to

 

operate. Feel resistor for heat. If no heat is felt,

cycles.

 

 

replace resistor.

 

 

 

Defective thermostat.

Replace thermostat and check operation.

 

 

 

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

Fan motor does not

Defective motor.

Check and replace.

Open or shorted capacitor.

Replace capacitor and check.

operate in "Constant"

Condenser fan frozen to base pan.

Check if drain pan valve is open. If not, replace.

or "MoneySaver"

Loose connections.

Check all connections. Check voltage to fan motor.

position.

 

 

 

 

 

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

 

 

 

Heating capillary tube partially restricted.

Check for partially starved outer coil. Replace

 

 

heating capillary tube.

Cooling adequate,

Check valve leaking internally.

Switch unit several times from heating to cooling.

 

Check temperature rise across coil. Refer to specifi-

heating insufficient.

 

 

cation sheet for correct temperature rise.

 

 

 

Reversing valve failing to shift

Deenergize solenoid coil, raise head pressure,

 

energize solenoid to break loose. If valve fails to

 

completely – bypassing hot gas.

 

make complete shift, replace valve.

 

 

 

 

 

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Contents 2003 Table of Contents RAC Serial Number Identification Guide 1st Digit Function00001 Page Data Evaporator AIR Operating Electrical Breaker Pressures Ratings Refrig Fuse Performance Evaporator AIR Operating Electrical Breaker Data SS10J10AR-A TEMP. DEG. F Pressures Ratings SC06H10E HeatingBtuh WY09A33F-A WY12A33F-A HeatingAmps Refrigeration System Sequence of Operation Grounding Wire SizeFuse/Circuit BreakerWinding Test Thermal Overload ExternalChecking Compressor Efficiency FAN Motor Terminal Overload TestTerminal Overload Internal Checking the Internal OverloadResistor System Control Panel System Control Panel KQ Models Only- See FigureEQ Model Only See Figure System Control Panel YQ Model Only System Control Switch Test System Control Switch WE & WY Models See FigureSystem Control Panel See Figure System Control Switch KS, SS, KM, SM, SL Models See FigureHeat Pump & Electric Heat Models See Figure System Control SwitchSmart Center Electronic Control Center To SET Mode of OperationTo Adjust Temperature To Adjust FAN SpeedTo SET Hour Clock To SET the TimerTesting the Electronic Control Testing the Electronic Control Error Code ListingsThermostat Models ES, YS, EM, YM, EL, YL See Figure TestThermostat SQ & KQ Models See Figure Thermostat YQ Model Only See FigureDefrost Thermostat Heat Pump Models Only Thermostat AdjustmentThermostat Bulb Location CAPACITOR, RUN See Figure Defrost Bulb Location Heat Pump Models OnlyCapacitor Test Heat Pumps Reversing Valve See Figure Check Valve OperationSolenoid Coil Heat Pump Models Only See Figure Testing Reversing ValveTo Test Equipment Required VALVE, Drain PAN See FigureHeating Element See Figure Sealed Refrigeration System RepairsEquipment Must be Capable Hermetic Component ReplacementSpecial Procedure in the Case Compressor Motor Burnout Rotary Compressor Special Troubleshooting and ServiceMethod of Charging Undercharged Refrigerant SystemsOvercharged Refrigerant Systems Restricted Refrigerant System Routine Maintenance Troubleshooting Touch Test Chart To Service Reversing Valves Problem To Correct Troubleshooting CoolingProblem Possible Cause To Correct Cycles Problem Possible Cause To Correct Troubleshooting Heating Heat pumps Problem Possible Cause To Correct Off and the electric element is energized Troubleshooting Heating Cooling/Electric Models Troubleshooting Chart Cooling YES System Cools When Heating is DesiredModels SQ06J10B-B, SQ06J10B-A, SQ08J10C-A, SQ08J10D-A Models KQ08J10B-1, KQ08J10B-A, KQ08J10C-A Schematic YQ06J10B-A ModelModel SC06H10D 619-405-06 Alternate SL28J30B-A, SL35J30-A, SL35J30-BConductor Or Brown RED Blue To Capacitor Bracket Wiring Diagram YS12J33-A, YM18J34B-A, YL24J35C-A Model EQ08J11-A, EQ08J11-B IDT Ovld Neutral WE09A33E-B, WE12A33E-A, WE15A33-A WY09A33F-A, WY12A33G-A Checking Room Temperature Testing The Electronic Control XQ Boards & QME BoardsFriedrich AIR Conditioning CO
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