Trouble Shooting Guide

Page 2 of 9

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

 

 

 

Fan will not run

A. No power to unit

A. Turn power on

 

B. No power to motor from

B. Check for voltage from relay board

 

relay board

to motor

 

C. Micro switch no closing

C. Check micro switches

Button on key pad

A. Loose ribbon

A. Check that ribbon connection from

not responding

connection between key

key pad is attached to smart board

 

pad and 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. Re attach 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

A. Normal operation. Unit will not go

 

above 150°F

to OFF until cavity temperature is

 

 

below 150°F

 

 

 

No HIGH speed

A. Bad relay board

A. CR3 on relay board should be on, if

BUT HIGH speed

 

not check for 24VDC +/- 10% at

LED is illuminated

 

pins 5 & 7 at relay board. If voltage

on key pad

 

present replace relay board

 

B. Bad smart board

B. Check for 24VDC +/- 10%between

 

 

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

LOW speed LED is

 

not check for 24VDC +/- 10% at

illuminated on key

 

pins 5 & 8 at relay board. If voltage

pad

 

is 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

A. Unplug unit from supply. With door

DOOR shown in

door switch

closed between NO and COM

display

 

switch should be open.

 

 

B. With door open to 30° angle switch

 

 

should be closed

 

 

C. With door open all the way switch

 

 

should be closed

Unit will not turn ON

A. Loose ribbon

A. Check connection

when button pushed,

connection between key

 

display reads OFF

pad and smart board

 

 

B. Faulty key pad

B. Refer to key pad testing procedure

 

 

on bulletin # B-107-2001

Page 88

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

Page 88
Image 88
Garland 200 service manual Trouble Shooting Guide

200 specifications

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