Sanyo MDF-U500VX - High Temperature Alarm Troubleshooting; High Temp Alarm Flowchart

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NO
(
Unit is in normal condition䋩
YES
NO YES
㪰㪜㪪
NO
NO YES
YES
NO
NO YES
YES
NO YES
㪰㪜㪪
NO
NO
㪰㪜㪪
(Overcurrent)
High temp. alarm
䋨Condition䋩
When chamber temp. reaches to
Set temp +5䌾20㷄
䋨Factory default:+10㷄䋩
䋨Alarm indication䋩
䇭䊶ALARM lamp blinks.
䇭䊶Temperature indication in reverse and non-reverse characters
䇭䊶Message "High Temp Warning 20XX/XX/XX XX:XX"
䇭䊶Audible alarm sounds intermittently and remote alarm activates after delay time passes.
䇭䊶Delay time is changeable between 0䌾15 minutes.䋨Factory default: 15min.䋩
Does compressor
A turn on?
Does control relay A
turn on?
#1-#5: DC12V (Blue䋩
Does compressor
B turn on?
Does condensing
fan motor A turn
on?
Does condensing fan
motor B turn on?
Does fan motor relay A
turn on䋿
#1-#5: DC12V(Brown䋩
Does fan motor relay B
turn on?
#1-#5: DC12V(Pink䋩
Does control relay B
turn on?
#1-#5: DC12V(Yellow䋩
Are you sure currents in
compressor A and B are
within normal range?
Check gas leak
Check overload relay A
Check overload relay B
Check #1-#2 for CN4 on Main PCB
Check #3-#4 for CN4 on Main PCB
Check #1-#2 for CN9 on Main PCB
Check fan motor relay A
Check #3-#4 for CN9 on Main PCB
Check both compressor A and B
Check fan motor relay B