Rinnai N Series User manual

N-Series
Error indication switch (REUOPU3)
N-Series error indication switch 12554-A 01-20 I page 1 of 1
Rinnai NZ Ltd (0800 743 624)
Ensure the power supply to the Rinnai INFINITY is disconnected before commencing
installation. Removing the front cover will expose live mains voltage connections.
WARNING
About the N-Series error switch
The Rinnai INFINITY water heater error switch is a volt-free normally open or normally closed
switch. The switch will shift to the reverse position when there is an active error in the water heater.
The switch is intended to be connected to a monitoring system such as a BMS (building monitoring
system) or other visual, or audible error indication system.
Systems designers should note that some errors will reset the switch to the normal state under
certain conditions. It is important that this is understood when developing monitoring and response
systems.
Error indication
switch
Accessory
cable
Mounting screw
and crimp
connectors
Kit contents
Suitability
The REUOPU3 is suitable for the N-Series
models only. One error switch is required for
each unit—the switch is installed inside the
water heater.
Switch rating: 24 V (AC or DC), 1 A
Systems requiring loads greater than this
should be congured via an external relay.
Installation
1. Remove the water heater front cover.
2. Connect the accessory cable main wiring
loom into the accessory port of the PCB,
refer image for position.
3. Connect the cable labeled ‘BMS/Air
Handler’ into the error indication switch.
4. Attach the error switch to the mounting
bracket (above the controller) inside the
unit. The orientation will di󰀨er depending on
whether the model is external or internal,
refer images on next page.
5. With the crimp connectors supplied,
join the red and black wires of the error
indication switch to the monitoring system
via the remote controller access hole at the
bottom of the water heater. Polarity is not
important.
6. Replace the water heater front cover and
reconnect the water supply.
Accessory port
PCB accessory port position
Black = common
Red = normally open
White = normally closed

N-Series error indication switch 12554-A 02-19 I page 2 of 2
Rinnai NZ Ltd (0800 743 624)
N-Series
Error indication switch (REUOPU3)
Testing
The operation can be quickly tested by passing
water through the unit with the gas supply shut
o󰀨.
After several ignition attempts the combustion
fan should be heard to stop and error code 11
should display on the inbuilt controller—within
15 seconds the error switch should reverse
position. This can be veried with a multimeter.
The switch should remain in this position.
Turn o󰀨 the water ow and turn on the gas
supply. Restart the water ow. The water
heater should ignite as normal and the status
of the monitor should display the water heater
set temperature. At this point the error switch
should return to the normal position.
Error codes
General error codes
When an error occurs the Rinnai INFINITY will
shut itself down. Most errors will reset when the
water ow stops, either by a tap being turned
o󰀨, circulating pump stopping and/or the power
being switched o󰀨.
Lime check (LC) error code
In hard water areas calcium is deposited
within the tubes of the heat exchanger. This
reduces the heat transfer within the water
heater. The Rinnai INFINITY detects this and
displays an LC error code. This will not prevent
the operation of the unit, but indicates to the
customer that maintenance is required.
When LC is displayed the error switch will
remain in the reverse position at all times,
except where a remote control (if tted), is
switched o󰀨.
The time charts shows the relationship between
the errors indicated by the error switch, and the
output shown on the inbuilt controller.
Response to errors
If an error is currently active, the error code
can be read o󰀨 the inbuilt controller. Any active
error, other than LC, indicates the unit is not
currently heating the water.
Error codes 11 and 12 usually indicate a failure
in the gas supply. To reset an error code 11
or 12, the water ow through the unit must be
stopped for a few seconds and then restarted.
If an error has occurred the error history can
be read from the controller using the procedure
described below.
All errors, other than resetting errors 11 and
12 must be dealt with by a Rinnai authorised
service centre. Providing the error code to the
service centre at the time of making a service
call will be helpful in rectifying the problem.
Retrieving error code history
1. Have the controller turned o󰀨, but the power
on.
2. Hold the On/O󰀨 button for two seconds
while at the same time pressing the up
arrow button, and then release.
3. The controller will display the last nine error
codes, the latest code displaying rst. If less
than nine codes, or no error codes ‘--’ will
be displayed.
Error codes are displayed for three minutes. To
return the controller to normal operation, press
the temperature up arrow and then press and
hold the On/O󰀨 button.

N-Series
Error indication switch (REUOPU3)
N-Series error indication switch 12554-A 01-20 I page 3 of 3
Rinnai NZ Ltd (0800 743 624)
Error switch orientation inside N-Series units
External unit board faces out Internal unit board faces in
Operation time charts
Remote controller
Inbuilt controller
Error switch
Error
Displayed
Blank
Displayed
Blank
Reverse
Normal
Error
occurs
Remote controller
Inbuilt controller
Error switch
Displayed
Blank
Displayed
Blank
Reverse
Normal
LC and set temp. flash alternately
LC only flashes
LC and set temp. flash alternately
LC only flashes
LC
No water flow
or remote
control off
Water flow
> activation
or remote
control on
Combustion
starts
No water
flow
LC
detect
Water flow
> activation
Combustion
starts
No water
flow
Remote
control off

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N-Series error indication switch 12554-A