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.

 

 

 

 

 

43

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Friedrich racservmn service manual Troubleshooting Heating Cooling/Electric Models
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racservmn specifications

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