CFEWH SERIES 2
–
Three phase | INSTALLATION Manual © Mar 2022 | MicroHeat Technologies Pty LTD Page
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Diagnostics and Error Descriptions
Diagnostics and Error Descriptions
Error Description (Cause)
Error Code
Error Type
LED Display
Not powered
N/A
No error
No color
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
AC Mains electrical supply failure
ac
Blocking / Resolving
Flashing
RED
High temperature limit exceeded >70°C
Fa
Mechanical Lockout
RED
Conductivity too high
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
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.
GREEN
RED
ORANGE
