Jet MAXI D125 Operation & Maintenance Manual page 36

Symptom
P1 and/or P2 FAIL is displayed
P2 FAIL is displayed but the unit
is a single pump model
LOW H20 fault is displayed
HIGH H20 fault is displayed
Pressure reading does not
match actual system pressure.
ERROR 1 fault is displayed
Pump runs but does not make
up pressure
The pump is persistently
becoming air-locked
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Problem
The PUMP TYPE option is set
incorrectly.
The relevant pump has failed
The PUMPS NUMBER option is
incorrectly set to 2
The mains water supply to the unit has
been isolated
The mains pressure is poor
A non-standard electrical connection
has been made into terminals 19 & 20
The low water float switch has failed
The digital controller has failed
A non-standard electrical connection
has been made into terminals 21 & 22
The digital controller has failed
The internal isolation valve within the
unit is closed
The SENSOR TYPE option is set
incorrectly
A non-return valve has been installed
between the unit and the system
The pressure sensor has failed
The SENSOR TYPE option is set
incorrectly
The pressure sensor has failed
The pump is air-locked and not pumping
water
The wrong/no flow restrictor is installed
in the float valve (mini and midi units
only)
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Review PUMP TYPE setting
Replace pump
Set PUMPS NUMBER to 1
Turn on the mains water supply
The fault will clear once the break tank
has been re-filled
Remove all non-standard electrical
connections
Replace low water float switch
Replace digital controller
Remove all non-standard electrical
connections
Replace digital controller
Open the internal isolation valve
Review SENSOR TYPE setting
Remove non-return valve
Replace pressure sensor
Review SENSOR TYPE setting
Replace pressure sensor
Bleed the pump
Check float valve flow restrictor
selection (mini and midi units only)
.
Solution
Rev 8.1 Oct-15 Page 36 / 42