Tenways Climate Control Solutions
CoolAutomation’s UK distributors
Site: A London residential apartment served by a leading regional HVAC service provider.
Solution: Predictive Maintenance Suite
HVAC System: Mitsubishi Electric VRF
Remote Diagnostics Case Study:
Mitsubishi Electric VRF Error 5103
The Customer
Customer Challenge
Following a customer complaint, a respected London-based service provider found that error code 5103 was displayed by a bedroom indoor air-conditioning unit. The error was caused by an abnormal thermistor reading.
Possible triggers:
1
Return Air Sensor
2
Liquid Pipe Sensor
3
Gas Pipe Sensor
The Traditional Course Of Action
1
A technician arrives onsite to physically access the system
2
Sensor resistance is checked (5.3k ohm @ 25°C)
3
The possibility that a PCB might not be reading correctly is examined.
4
A fix is applied
5
The technician returns to the site to collect new data and verify 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 |