Lennox International Inc 61H42 Yes, Defrost Control Troubleshooting Flowchart, Start Here

Page 4

DEFROST CONTROL TROUBLESHOOTING FLOWCHART

START HERE

I

Check control transformer primary and secondary voltages. Repair or replace as necessary.

I

Turn off power to unit.

I

Check defrost sensor. Is sensor temperature or pressure acti-

............i ....

1

.o___1

Is defrost control set for

Is compressor

contactor

30, 60 or 90 minute de =

 

energized?

frost intervals?

 

 

 

 

i---No

................I

Yes

Check thermostat and thermostat widng. Repair or replace as necessary

vated? For help in determining, re- fer to operation of control in unit installation instructions and unit wiring diagram.

I

II

I

Repeat troubleshooting procedure.

Does un_ go into defrost within appropriate time?

Check circuit from "HLD" terminal back to thermo- stat, Repair or replace as necessary.

t

I

Pressure

 

 

Temperatu

re

 

 

 

 

I

 

 

Is sensor

making good

 

 

contact

with

coil?

 

Yes _

 

No

 

 

 

 

 

I

 

 

 

 

 

Repair or

 

 

 

 

replace sensor

 

 

 

 

 

bracket.

Check all electrical

connections

 

at the defrost control. Defrost

 

sensor

and defrost

relay.

 

 

I

 

 

 

 

Connect

a jumper

across

 

the defrost

relay.

 

 

 

I

 

 

 

 

Connect a jumper across the two

Yes

 

No _

 

Repeat

 

troubleshooting

 

]

 

procedure.

i

 

 

 

 

 

Unit is operating

properly.

Check

voltage across "OUT"

Turn off power

to unit,

terminal

and

"COM"

terminal.

Remove all test jumpers.

 

Is voltage

24 ±

 

6VAC?

Reassemble

unit.

 

 

 

 

 

 

Yes

I

Connect a jumper between "OUT" terminal

and "COM" terminal. CAUTION-Be careful not to short "OUT" terminal to "24v" terminal,

Permanent controt damage could result.

I

Does unit go immediately into defrost?

Yes t

No

"TST" pins on the delrost Control,

I

Turn indoor thermostat to

heat mode and adjust to high-

est temperature setting.

1

Turn on power to unit.

I

I

Turn off power to unit. Remove all test jumpers.

Replace defrost control with new control board,

Repeat troubleshooting procedure.

Check voltage across de- frost relay coil. Is voltage 24 ± 6VAC?

I

["-_

Yes _

No

Check voltage across "HLD"

 

terminal and "COM" termi-

 

nal, Is voltage 24 + 6VAC?

 

1

 

 

 

I

Yes

 

 

ls solenoid

engaging?

 

Yes _t

No

 

i

1

 

Replace reversing

Replace solenoid.

 

valve. Repeat

Repeat troubleshoot-

 

troubleshooting

ing procedure,

 

procedure.

 

 

Is defrost relay energized?

 

 

 

 

 

Yes

 

I

No

 

 

 

 

 

 

 

 

 

 

 

 

Check voltage

across re=

 

 

 

 

 

 

versing valve coil. Is volt-

 

 

 

Check

voltage

across "24Y"

 

age 24 ÷

6VAC?

 

 

 

 

 

I

I

 

 

 

terminal and "COM" terminal. Is

 

 

 

 

 

voltage 24 ± 6VAC?

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

I

Yes

 

 

 

 

 

 

 

NO

,,,, ,,,,,,

_

 

 

 

 

I

 

 

I

 

 

I

 

Turn off power to unit.

 

 

 

 

 

 

Turn off power to unit.

 

 

Check

and repair

circuit

 

 

 

Check circuit

from defrost

 

 

from

reversing

valve

Turn

off power

to unit.

 

switch

back

to control

through

defrost relay to

 

Replace defrost

relay,

 

transformer. Repair of re-

control

transformer.

 

Repeat troubleshooting

 

place

as necessary,

Repeat

troubleshooting

 

 

procedure.

 

Repeat

troubleshooting

 

 

procedure.

 

 

 

 

 

 

 

 

procedure,

 

 

 

 

 

 

 

 

 

 

 

Page 4

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Contents Solid State Defrost Replacement Board TOM9 Typical WiringTOP View Front View Test Mode Control Timings Timing JumperYes Defrost Control Troubleshooting FlowchartStart Here

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