GENERAL TROUBLE SHOOTING GUIDE

Problem

Possible Cause

Corrective Action

 

 

 

 

 

Fan will not run

A.

No Power to Unit

A.

Turn Power on

 

 

 

 

 

 

B.

No power to motor from relay board

B.

Check for voltage from relay board to motor

 

 

 

 

 

 

C.

Micro Switch Not closing

C.

Check micro switches

Button on key pad not

A.

Loose ribbon connection between

A.

Check that ribbon connection from key pad is

responding

 

key pad and smart board

 

attached to smart board

 

 

 

 

 

 

B.

Faulty key pad

B.

Refer to key pad testing procedure on bulletin

 

 

 

 

#B-107-2001

 

 

 

 

 

'Prob' in display

A.

Probe disconnected

A.

Reattach probe

 

 

 

 

 

 

B.

Probe has failed

B.

Confirm ohm resistance of probe. Refer to cavity

 

 

 

 

probe chart for readings.

 

 

 

C.

Check for continuity between probe connection

 

 

 

 

at relay board, probe harness & probe

 

 

 

 

 

Unit will not shut off

A.

Cavity temperature above 150°F

A.

Normal operation. Unit will not go to Off until

 

 

 

 

cavity temperature is below 150°F

 

 

 

 

 

No HIGH speed but

A.

Bad relay board

A.

CR3 on relay board should be on, if not check

HIGH speed LED is

 

 

 

for 24VDC ±10% at pins 5 & 7 at relay board. If

illuminated on key pad

 

 

 

voltage present replace relay board

 

B.

Bad smart board

B.

Check for 24VDC ±10% at pins 5 & 7 at relay

 

 

 

 

board. If voltage is not present replace smart

 

 

 

 

board

 

 

 

 

 

No LOW speed but

A.

Bad relay board

A.

CR4 on relay board should be on, if not check

LOW speed LED is

 

 

 

for 24VDC ±10% at pins 5 & 8 at relay board. If

illuminated on key pad

 

 

 

voltage present replace relay board

 

 

 

 

 

 

B.

Bad smart board

B.

Check for 24VDC ±10% at pins 5 & 8 at relay

 

 

 

 

board. If voltage is not present replace smart

 

 

 

 

board

Unit will not heat.

A.

Open circuit on upper door switch

A.

Unplug unit from supply. With door closed

DOOR shown in

 

 

 

between NO and COM switch should be open.

display

 

 

 

 

 

 

B.

With door open to 30° angle switch should be

 

 

 

 

 

 

 

closed

 

 

 

 

 

 

 

 

C.

With door open all the way switch should be

 

 

 

 

closed.

Ignition - Lighting

A.

Incorrect gas pressure or gas turned

A.

Check incoming gas pressure

problems

 

off

 

 

 

 

 

 

 

 

B.

Various faults possible

B.

Refer to trial and ignition flow chart in Section

 

 

 

 

Two of this manual

 

 

 

 

 

Unit will not turn

A.

Loose ribbon connection between

A.

Check connection

ON when button is

 

key pad and smart board

 

 

pushed, display reads

B.

Faulty key pad

B.

Refer to key pad testing procedure on bulletin

OFF

 

 

 

#B-107-2001

 

 

 

 

 

 

 

 

 

No Display

A.

No power to smart board

A.

Check for 24 VAC between pins 1 and 3 on smart

 

 

 

 

board. If voltage present check for 24 VAC at pins

 

 

 

 

1 and 3 at relay board.

 

 

 

 

 

 

B.

No power to relay board

B.

Check for 24 VAC into relay board and 24 VAC

 

 

 

 

out of relay board between pins 1 and 3 on relay

 

 

 

 

board

Page 64

Part # MCOSM06 Rev 1 (11/03/08)

Page 64
Image 64
Garland 200 service manual General Trouble Shooting Guide, Problem Possible Cause Corrective Action

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