Heatrae Sadia HI-MAX INSTANT ID 5-60 Installation, Operation And Maintenance Manual page 43

Fault / Error Code
O
O
O
O
O
Fault
F4 indicates that the HIU controller
has registered power consumption
outside the preset limits.
The result is that central heating and
DHW will not be available
F5 indicates that a fault has been
detected in the Aux return PT1000
sensor used for the compensated
heating function.
During this fault the HIU controller will
turn off the 'AUTO' function which is
used for compensated heating.
The HIU controller reverts to non
compensated heating until the fault
is rectifi ed.
The HIU Controller will automatically
reset back to AUTO mode when the
fault is rectifi ed.
F6 indicates a fault has been detected
in the PICV actuator.
The result is that central heating and
DHW will not be available as the
HIU controller will not allow these
functions until the fault is rectifi ed.
The HIU controller will automatically
reset to normal operation once the
cause of the fault has been corrected.
E0 indicates that the pressure switch
has dropped below its minimum
setting. The result is that central
heating will not be available as the
HIU controller will not allow these
functions until the fault is rectifi ed.
The HIU controller will automatically
reset to normal operation once the
cause of the fault has been corrected.
No display when the unit is powered
on.
Cause of fault
Issue with the pump motor. Check that the pump is fully
operational. See 8.1.7 on page 36.
Issue with the 3 port diverter
motor. Check error display on the pump.
Loose wire to the pump or 3 Check all cable and connectors.
port diverter.
Check pump functionality (see Figure
Incorrect wiring. 51 page 36).
Replace the pump if proven to have
failed.
Check that the 3 Port Diverter is fully
operational.
Check cable and connectors.
Check valve motor for operation.
Replace the valve actuator if proven
to have failed. Replace complete
valve and actuator if the valve body
is suspected of causing the actuator
to fail.
PT1000 heating sensor is Replace PT1000 sensor
broken or damaged.
Investigate reason for high temperature
PT1000 sensor detects a and shut down as necessary.
temperature > 110°C.
Check
PT1000 sensor is not properly connected.
connected into the controller
Replace PT1000 sensor.
box.
The HIU PID controller will automatically
PT1000 sensor cable is broken.
reset to normal operation once the
cause of the fault has be corrected.
Actuator faulty. Check cable and connectors.
PCB fault. Check PICV functionality and replace
the PICV actuator valve if found to be
Wiring fault.
faulty.
Lack of pressure in the central Check system pressure
heating system
Check cable and connectors to
Electric cable is damaged pressure switch
Pressure switch is faulty Check pressure switch functionality
Replace the pressure switch if found to
be faulty
Faulty display board. Check board an replace as necessary.
Faulty ribbon cable. Check ribbon cable and replace as
necessary.
Remedy
the PT1000 terminals are
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