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ERV
TROUBLESHOOTING
9.1.5.4 Sensor Alarms
NUMBER
NAME
STATUS SHOWN
MEANING
30
Al_OA_Temp_Prb
Auto reset
OA Temperature Sensor Error
31
Al_OA_Hum_Prb
Auto reset
OA Humidity Transducer Error
32
Al_RA_Temp_Prb
Auto reset
RA Temperature Sensor Error
33
Al_RA_Hum_Prb
Auto reset
RA Humidity Transducer Error
34
Al_SA_Temp_Prb
Auto reset
SA Temperature Sensor Error
35
Al_EA_Temp_Prb
Auto reset
EA Temperature Sensor Error
36
Al_OA_Flt_Press_Prb Auto reset
OA Filter Pressure Transducer
Alarm
37
Al_RA_Flt_Press_Prb Auto reset
RA Filter Pressure Transducer
Alarm
38
Al_OA_Flow_Rate_
Prb
Auto reset
OA Flow Rate Sensor Error
39
Al_EA_Flow_Rate_
Prb
Auto reset
EA Flow Rate Sensor Error
40
Al_CO2_Level_Prb
Auto reset
CO2 Sensor Error
41
Al_Duct_Press_Prb
Auto reset
Duct Pressure Probe Error
42
Al_Supply_Temp_Prb Auto reset
CA Temperature Sensor Error
44
Al_VOC_Level_Prb
Auto reset
VOC Sensor Error
Alarm Numbers 30–44:
Sensor Alarms
These alarms occur when the controller detects that sensor is not reading in the expected
range. Passive sensors such as temperature sensors show an error when the controller detects
a short circuit or open circuit. Active sensors (0–10V) are in alarm when they value read is
slightly above 10V.
To resolve the alarms, check the wiring to see if there is a loose wire or missing sensor.