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

- 45 -
NO
(Unit is in normal condition)
YES
NO
YES
YES YES
NO NO
YES YES
NO NO
Low temp. alarm
䋨Condition䋩
When chamber temp. reaches to
set temp.-5䌾-20㷄䋩
䋨Factory default:-10㷄䋩
䋨Alarm indication䋩
䊶ALARM lamp blinks
䊶Temperature indication in reverse and non-reverse characters
䊶Message "Low Temp Warning 20XX/XX/XX XX:XX"
䊶Audible alarm sounds intermittently and remote alarm activates after delay time passes
䊶Delay time is changeable between 0~15 minutes. (Factory default: 15min.)
Do both compressor
A
and B turn on?
Does control relay
A
turn on?
Control relay A
#1-#5:DC12V䋨Blue䋩
Check actual chamber temperature
Check actual chamber temperature
Check #1-#2 for CN9 on Main
PCB
Check control relay A
Check #1-#2 for CN4 on Main
PCB
Does control relay
B turn on?
Control relay B
#1-#5:DC12V䋨Yellow)
Check control relay B