Friedrich 2003 service manual Problem Possible Cause To Correct

Page 41

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

 

 

 

Outdoor thermostat does not cut off

Defective thermostat - replace.

Unit does not heat

compressor at the preselected tem-

 

adequately.

perature and bring on heating element.

 

 

Fresh air or exhaust door open.

Check if operating properly. Instruct customer

 

 

on proper use of control.

 

Dirty filter.

Clean as recommended in Owner’s Manual.

 

Unit undersized.

Check heat rise across coil. Refer to perfor-

 

 

mance data sheet on heat rise at various

 

 

outdoor ambients. If heat rise is satisfactory,

 

 

check if insulation can be added to attic or

 

 

walls.

PROBLEM

 

POSSIBLE CAUSE

 

TO CORRECT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Incorrect wiring.

 

Refer to applicable wiring diagram.

 

 

 

Defective solenoid coil.

 

Check for continuity of coil.

 

Unit cools when

 

Reversing valve fails to shift.

 

Block condenser coil and switch unit to cooling.

 

 

 

 

Allow pressure to build up in system, then

 

heat is called for.

 

 

 

 

 

 

 

switch to heating. If valve fails to shift, replace

 

 

 

 

 

 

 

 

 

 

valve.

 

 

 

Inoperative system switch.

 

Check for continuity of system switch.

 

 

 

 

 

 

 

 

 

 

 

 

 

PROBLEM

 

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

 

 

 

Outdoor thermostat does not cut off

Defective thermostat — replace.

 

 

compressor at the preselected tempera-

 

 

 

 

Unit does not heat

ture and bring on the heating element.

 

 

 

 

 

 

 

 

 

 

adequately.

 

 

 

 

 

 

Fresh air or exhaust door open.

Check if operating properly. Instruct customer on

 

 

 

 

 

 

proper use of control.

 

 

Dirty filter.

Clean as recommended in Owner’s Manual

 

 

Unit undersized.

Check heat rise across coil. Refer to performance

 

 

 

 

data sheet on heat rise at various outdoor ambients. If

 

 

 

 

heat rise is satisfactory, check if insulation can be

 

 

 

 

added to attic or walls.

 

 

 

 

 

 

 

 

 

 

 

PROBLEM

 

POSSIBLE CAUSE

TO CORRECT

 

Unit cools when heat is called for.

Incorrect wiring. Defective solenoid coil. Reversing valve fails to shift.

Inoperative system switch.

Refer to applicable wiring diagram. Check for continuity of coil.

Block condenser coil and switch unit to cooling. Allow pressure to build up in the system, then switch to heating. If valve fails to shift, replace valve.

Check for continuity of system switch.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

 

Heating capillary tube partially

Check for partially starved outer coil. Replace heating

 

restricted.

capillary tube.

Cooling is ad-

Check valve leaking internally.

Switch unit several times from heating to cooling.

 

Check temperature rise across the coil. Refer to

equate, but heating

 

 

specification sheet for correct temperature rise.

is insufficient.

 

Reversing valve failing to shift

Deenergize solenoid coil, raise head pressure, ener-

 

 

completely — bypassing hot gas.

gize solenoid to break loose. If valve fails to make

 

 

complete shift, replace valve.

41

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Contents 2003 Table of Contents 00001 1st Digit FunctionRAC Serial Number Identification Guide 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 HeatingAmps WY09A33F-A WY12A33F-A HeatingBtuh Refrigeration System Sequence of Operation Fuse/Circuit Wire SizeBreaker GroundingChecking Compressor Efficiency Thermal Overload ExternalWinding Test Terminal Overload Internal Terminal Overload TestChecking the Internal Overload FAN MotorResistor EQ Model Only See Figure System Control Panel KQ Models Only- See FigureSystem Control Panel 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 SwitchTo Adjust Temperature To SET Mode of OperationTo Adjust FAN Speed Smart Center Electronic Control CenterTesting the Electronic Control To SET the TimerTesting the Electronic Control Error Code Listings To SET Hour ClockThermostat SQ & KQ Models See Figure TestThermostat YQ Model Only See Figure Thermostat Models ES, YS, EM, YM, EL, YL See FigureThermostat Bulb Location Thermostat AdjustmentDefrost Thermostat Heat Pump Models Only Capacitor Test Defrost Bulb Location Heat Pump Models OnlyCAPACITOR, RUN See Figure Heat Pumps Reversing Valve See Figure Check Valve OperationTo Test Testing Reversing ValveSolenoid Coil Heat Pump Models Only See Figure Heating Element See Figure VALVE, Drain PAN See FigureSealed Refrigeration System Repairs Equipment RequiredSpecial Procedure in the Case Compressor Motor Burnout Hermetic Component ReplacementRotary Compressor Special Troubleshooting and Service Equipment Must be CapableMethod 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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