System error code 5103 was registered in a bedroom indoor air conditioning unit. The error was generated due to an abnormal thermistor reading.
Possible triggers:
1
Return Air Sensor
2
Liquid Pipe Sensor
3
Gas Pipe Sensor
Remote Diagnostics Case Study: Mitsubishi Electric VRF Error 5103
Customer Challenge
The Traditional Course Of Action
A technician visits the site, accesses the system physically, and:
1
Checks if the sensors are fixed properly to the terminal block
2
Checks sensor resistance (5.3k ohm @ 25°C)
3
Checks if a faulty PCB is not reading correctly, collects new data, and verifys the fix
Remote Course Of Action
1
Remote Diagnostics
A service engineer accesses CoolAutomation's HVAC Predictive Maintenance Suite to check system history.
2
Searching for the Error Cause
Looking at the AC unit's operation data for the last hour, all thermistor readings are normal.
3
Using Historic Data
Looking at the Predictive Maintenance Suite's historical data for the last 7 days, we see spikes in the gas pipe sensor. Therefore, it seems that this sensor is faulty and must be replaced (it is less likely that the indoor unit PCB is mistranslating the temp reading only occasionally). Also, the sensor connection should be checked to make sure it is properly placed.
Traditional HVAC Service Vs Remote - Comparison Table
| Traditional HVAC Service | Remote Service |
|---|---|
Multiple trips to the site are likely, as an engineer may need several visits before he witnesses the error in real-time | A single trip to the site |
Many hours of engineer time | One hour of engineer time on-site |
Multiple days of system downtime | Minimal system downtime |