30
(7)
E5(5E) -Internal and external communication error
Explanation of
error
Cause:
The frequency converter needs internal and external
communication.When the communication cannot be reached, the
internal and external units will indicate “internal and external
communication error”. Only “main internal control panel, connecting
cable and main external control panel” are related to communication;
but sometimes the communication error will be indicated when the
external unit has no power and the internal unit cannot connect with
the external unit due to other errors, then such situation shall be
distinguished from “pure communication error” and treated in a
different way.
Inspection path:
Check if the external unit can power on and work
(normally, the indicator light will turn off after lighting for several
seconds, relay picks up, and PTC won’t heat seriously)
1.
Can power on and work: Are the internal unit and external unit
matched→is the phase sequence of connecting wires of internal and
external units correct (the live wire of the internal unit connects with
that of the external unit, the null wire of the internal unit connects with
that of the external unit)→Connecting wires touched well→Main
internal control panel replacement→Main external control panel
replacement
2.
Cannot power on and work: Can AC 220V be delivered to the
terminal block of the external unit→Can the bridge rectifier and
module panel generate DC 310V→Can the main external control panel
generate a low voltage power supply of DC 5V→Does the main
external control panel show the status of periodical reset.
Tools required
for inspection
Multimeter, main internal control panel in normal condition
Frequent
problematic part
Connecting wire phase sequence and contact, main internal control
panel, main external control panel, module panel
Inspection
procedure and
key points
1.
Firstly, the IDU and the ODU should be matched and connected
properly.
2.
Observe the main external control panel, turn on the air conditioner,
three lights are all lighted up then off and the relay pulls in. If not, it is
power supply problem.
3.
Connect the black signal line S to terminal N of ODU. Turn on the
A/C, if "E5" is still reported, the main external control panel need to be
replaced. If "E5" is still reported at this time, go to step 4.
4.
Change a new main internal control panel, if the error code E5
remains, then the problem should be on the main external control
panel.
