PF1, PF2 and PF3 on a controller displays always indicates a sensor failure.
8.12 How to troubleshoot temperature sensor alarms
Elstat controllers manage sensor failures as follows:
l
PF1 alarms: EMS controllers stop running the compressor and then waits 60 seconds before re-starting
(switch off and then switch on).
If the fault continues, the EMS controller repeats and continues the cycle until the fault corrected.
l
PF2 alarms: EMS controllers continue running the compressor. EMS controllers alternate the display between
PF2and the appliance sensor temperature
indicating a fault.
l
PF3 alarms: EMS controllers continue to run the compressor normally and alternate the display PF3 and the
appliance sensor temperature.
Sensor faults may also be identified by using the input test within the test routine:
l See "How to run the test routine (tst)" on page 23
Follow the chart to troubleshoot problems with the appliance sensor, condenser sensor, evaporator
sensor or gas cooler sensor.
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27 February 2014
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