Installation manual

CFEWH SERIES 1
-
10 | INSTALLATIoN MANUAL ©2013 | MicroHeat Technologies Pty Ltd
2322
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: