SB-200 Alarm codes 03, 04 won't allow me to clear

[tooboosted]

so when i came upon this unit i rushed to conclusions and when i saw the codes i went in for changing out the sensors, after i changed out the discharge air sensor i went to go see if it could clear it still wouldn't clear, then the guy who owns the trailer said some guys in another town bypassed the sensor/unplugged/noone knows really what they did cause i couldn't find it, so now I'm stuck with a reefer that has 03 and 04 alarm codes and can't seem to figure out how to clear or diagnose the problem. any help would be great

[gravy258]

power ON, cycles OFF, press TK button and CLEAR button at same time, before engine cranks.
This will take you to hourmeter screen. Clear alarms.
If no go to DDUR 45 press TK and CLEAR to guarded access menu. Clear alarms.

If the sensor is showing a reading on the screen its working. If it shows -- its not connected or is stuffed.
If the sensor reading on the screen is 'jumping' around, remove the two lower micro plugs and clean with electrical contact cleaner.

[IRMechanik]

power ON, cycles OFF, press TK button and CLEAR button at same time, before engine cranks.
This will take you to hourmeter screen. Clear alarms.
If no go to DDUR 45 press TK and CLEAR to guarded access menu. Clear alarms.

If the sensor is showing a reading on the screen its working. If it shows -- its not connected or is stuffed.
If the sensor reading on the screen is 'jumping' around, remove the two lower micro plugs and clean with electrical contact cleaner.

while your're in guarded access, check and make sure the sensor grades are set correctly.

[Maximo111]

Hello there.
How is calibration done. Notice that some sensors don't have any numbers,but others do.
What is the ohms the sensors suppose to have?

[moggy66]

Hello there.
How is calibration done. Notice that some sensors don't have any numbers,but others do.
What is the ohms the sensors suppose to have?
Calibration is done at the factory I believe only the supply and discharge are calibrated/ graded and need to be set up in the micro, coil and defrost sensors are non graded

[Maximo111]

Thank you for the reply.
I had these alarms come abouts on our reefer lately. The man that was called to fix this problem clear them some how. Alarms 3,4 and 11 I think. There is a 13 alarm on another unit.
My question is: is clearing alarm fixes problem?

[Maximo111]

Supply? Like return air?

[gravy258]

yes, return air.
The ambient sensor and the evaporator coil sensor are not graded.

You'll see the sensor grades in the guarded access screen after the hourmeter screens.

Most sensor faults are related to the plugs in the back of the micro.
Remove and clean the two lower plug contacts with electrical cleaner to start with.
Then try electrical grease.
Then try replacing the micro pins as a last resort.

[Shawn Carvin]

hi everyone I'm come from Taiwan
i'm apologize for my english is bad
There is a suggestion, maybe you can check the micor pins
In control box section,the sensor harness connec to micor
here's pin maybe poor contact RTN-1 & RTP-01

[Maximo111]

Hello there. a question about super 2 thnermo guard VI. Do you know how to clear an alarm 4? Not many buttons to press on this thing.
Thanks

[gravy258]

got to DDUR 45 , hold TK button, (hourmeter menu)go to DDUR 45 press TK button, (guarded access) go to alarm then press enter to clear(will be before DDUR 45)