Boss MX1-3E - Operation; Fault Codes

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Operation
Once commissioned, the pressurisation unit should operate without any user intervention.
Under normal operating conditions, the display will show the current system pressure in Bar.
While the unit is filling, the display will show <PUMP 1 RUN> or <PUMP 2 RUN> depending on which
pump is currently running.
If the unit identifies a fault, the display will show the relevant fault code.
If the pressurisation unit is showing a fault code on the display, holding down the [SET]
button will cause the current system pressure to be temporarily shown on the display.
Fault Codes
The following table gives the meanings of all fault codes used on the digital controller:
Fault Code
Description
Auto/Manual
Reset
LOW PRESSURE
The system pressure is below the [LOW PRESSURE] set
point.
User Defined
HIGH PRESSURE
The system pressure is above the [HIGH PRESSURE] set
point.
User Defined
LOW H20
The break-tank low level float switch has been activated
Auto Reset
HIGH H20
The break-tank high level float switch has been activated
Auto Reset
P1 FAIL
The controller has detected a fault (incorrect current draw)
on the respective pump
Manual Reset
P2 FAIL
P1 FLOOD LIMIT
The respective pump has run for longer than the [FLOOD
LIMIT] period
Manual Reset
P2 FLOOD LIMIT
ERR. 1
The signal from the pressure sensor is out of range
Manual Reset
LOW GLYCOL
The low glycol switch has been activated (glycol units only)
Auto Reset
EXCESSIVE DEMAND
There have been 4 pump starts within an 8 hour period
Manual Reset
SERVICE
The pressurisation unit is due an annual service
Manual Reset
For practical guidance on diagnosing and rectifying faults, please refer to the
Troubleshooting section of this manual.