Fault Codes - Heatrae Sadia HI-MAX INSTANT ID 5-60 Installation, Operation And Maintenance Manual

10.2 Levels of fault severity
The HI-MAX INSTANT runs the heating or hot water
modes independently of one another. This allows the unit
to work with two levels of fault severity.
Level 1 faults are less severe than level 2 faults. If the unit
has a level 1 fault, other mode of operation that is not
associated with the fault will still be allowed to operate.
F0, F1, F2, and F5 are level 1 faults.
Level 2 faults are the most serious. These faults will
prevent the unit from operating correctly in all functions.
All faults are indicated by the fault triangle in the top
right hand corner. F3, F4 and F6 are level 2 faults.
The unit can still run in either of the other none-effected
modes of operation or in standby mode.
If a level 1 fault has occurred, the fault triangle will be
indicated along with the other, none effected mode of
operation if in operation.
If a level 2 fault has occurred the unit will not run in any
mode and the fault will be indicated on the screen. If
Table 7 Fault and Error codes
Fault / Error Code
42
Fault
F0 indicates that a fault has been
detected by the NTC sensor used to
monitor the DHW temperature.
The HIU PID Controller automatically
defaults the diverter valve to the
O
heating plate heat exchanger. If
the unit has an F0 fault DHW is not
available until the error has been
resolved.
F1 indicates that a fault has been
detected by the PT1000 central
heating fl ow temperature sensor.
The result is that the HIU controller
will not allow the central heating to
O
operate until the fault is rectifi ed.
F2 indicates that a fault in the external
(outdoor) PT1000 sensor has been
detected. This optional sensor is used
for the weather compensated heating
function.
During this fault the HIU controller will
then turn off the 'AUTO' function which
O
is used for weather compensation.
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
F3 indicates that a fault has been
detected in the electricity transformer
inside the HIU controller.
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
O
more than one fault has occurred the faults will be listed
in numerical order and the number of faults shown below
the fault triangle.
10.3 Fault interrogation
As just mentioned, it is possible that more than one
fault can occur at any one time. The number of faults are
shown below the fault triangle. In order to fi nd out what
fault(s) have occurred simply press the OK button to scroll
through them.

All faults are automatically cleared once the
problem has been resolved.

10.4 Fault codes

The HIU fault codes and their likely causes are listed
below in Table 7.
Cause of fault
NTC sensor is broken or
damaged.
NTC sensor detects
temperature > 70°C.
NTC sensor is not properly
connected into the controller
box.
NTC cable is broken.
PT1000 heating sensor
broken or damaged.
PT1000 sensor detects
temperature > 110°C.
PT1000 sensor is not properly
connected into the controller
box.
PT1000 sensor cable is broken.
PT1000 heating sensor
broken or damaged.
PT1000 sensor detects
temperature > 110°C.
PT1000 sensor is not properly
connected into the controller
box.
PT1000 sensor cable is broken.
Incorrect power supply.
Transformer faulty.
Remedy
Replace NTC sensor
Run hot tap to cool the unit down and
a clear fault and shut down as necessary.
Check the NTC terminals are connected.
Replace NTC sensor.
The HIU PID Controller will automatically
reset to normal operation once the
cause of the fault has been corrected.
is Replace PT1000 sensor
Investigate reason for high temperature
a and shut down as necessary.
Check the PT1000 terminals
connected.
Replace PT1000 sensor.
The HIU PID controller will automatically
reset to normal operation once the
cause of the fault has been corrected.
is Replace PT1000 sensor
Investigate reason for high temperature
a and shut down as necessary.
Check the PT1000 terminals
connected.
The HIU PID controller will automatically
reset to normal operation once the
cause of the fault has been corrected.
Check power supply.
Once proven the fault lies within the
controller then disconnect
supply and disconnect all connections
to the HIU PID Controller, marking them
ready for reconnection.
Remove the controller from it's securing
clips.
Install the new HIU PID Controller,
making all the connections as per the
wiring diagram.
The HIU PID Controller will automatically
reset to normal operation once the
cause of the fault has been corrected.
are
are
power