CFEWH SERIES 1-10
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INSTALLATIoN
Manual ©2013
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MicroHeat Technologies Pty ltd
23
22
2. Depress the PCBA RESET Button (21) mounted on the PCBA (8).
Reference
Diagnositics and Error Descriptions
Reference
Mechanical Lockout Error
The mechanical lockout condition is indicated by the LED illuminating
RED
continuously.
The unit incorporates an error detection process that may result in a mechanical lockout condition. This
indicates a serious malfunction that cannot be automatically resolved and will require manual intervention.
Normal operation
cannot be resumed by switching the appliance OFF and ON. Manual Intervention
Procedure is required.
21
PCBA Reset
Button
19
LED Indicator/Display PCB Plug and Cable
If the error has been successfully RESET, the
gREEN
LED on the PCB will start to flash slowly, indicating
the unit is now in standby mode.
3. Reconnect the Connecting Cable (19) and replace the Exterior Cover.
IMPORTANT
• If the
RED
LED remains either flashing or illuminated, an error condition is still present.
There are NO user serviceable parts inside the housing, so no further action can be taken.
• Call for a qualified Service Technician/Installer to attend.
ORANGE
GREEN
RED
Error Description (Cause)
Error Code
Error Type
LED Display
Not powered
N/A
No error
No colour
Normal operation standby
00
No error
Slow Flashing
gREEN
Normal operation – heating
01
No error
Fast Flashing
gREEN
Water conductivity too low
No error
ORANgE
In Priming Mode
No error
ORANgE
Operating temperature too low
A4
Blocking / Resolving
Flashing
RED
Operating temperature too high
A5
Blocking / Resolving
Flashing
RED
Outlet water temperature 5°C above set point
A6
Blocking / Resolving
Flashing
RED
Inlet cold water input sensor open circuit
A7
Blocking / Resolving
Flashing
RED
Inlet cold water input sensor short circuit
A8
Blocking / Resolving
Flashing
RED
Outlet water temperature sensor open circuit
A9
Blocking / Resolving
Flashing
RED
Outlet water temperature sensor short circuit
AA
Blocking / Resolving
Flashing
RED
High temperature limit exceeded >70°C
FA
Mechanical Lockout
RED
Over Current Condition
FB
Mechanical Lockout
RED
Earth Leakage Detection
FC
Mechanical Lockout
RED
CPU Watch Dog Timer Error
FD
Mechanical Lockout
RED
Temperature Controller Error
(A6 Error >5 times in one operation)
FE
Mechanical Lockout
RED
Unknown Failure
FF
Mechanical Lockout
RED
Water Conductivity too high
FB
Mechanical Lockout
RED
Manual Intervention
IMPORTANT – The Manual Intervention procedure must only be performed by a trained professional.
The problem may be resolved by resetting the unit by pressing the PCBA RESET Button (21).
This can be done by following these steps:
1. Remove the Exterior Cover and unplug the connecting cable (19) from the PCB.
The three LED indicators on the PCB will be illuminated when the unit is in standby, running or in error mode.
Error Code Display
(Only viewable on the CFEWH SERIES 1 PREMIUM Model)
If the unit experiences some type of malfunction, the
LED indicator will also display an error code. You will see
Er appear in the TEMP SETTING window and then an
alpha-numerical code in the WATER FLOW RATE window.
For example – this shows error code A6:
