Bosch Climate 5000 Series Service Manual page 44

4 4 | Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit
Applicable models:
Cassette IDU System: 36K ~ 48K
Ducted IDU System: 36K ~ 60K
Error Code
Malfunction decision conditions
Supposed causes
Figure 36
Troubleshooting:
Power off, then restart the unit 2
minutes later. Does a problem still
minutes later. Does a problem still
Replace the indoor main PCB, is the
Replace the indoor main PCB, is the
Figure 37
Data subject to change
E1
Indoor unit does not receive the feedback from outdoor unit for 60 seconds or outdoor unit does not
receive feedback from indoor unit for 120 seconds.
Power off f f , then restart the unit 2
exist?
exist?
Yes
Is there any interference such
Is there any interf r r erence such
as too many lamps, power
as too many lamps, power
transformers? Or is the signal
transfo f f rmers? Or is the signal
wire too long?
wire too long?
No
Is the signal wire a shield cable
Is the signal wire a shield cable
and is the shield cable a
and is the shield cable a
grounding?
Yes
Is the signal wire is broken?
Is the signal wire is broken?
No
Are the signal wires properly
Are the signal wires properly
inserted on PCB?
inserted on PCB?
Yes
error resolved?
error resolved?
No
Replace the outdoor Main PCB.
Replace the outdoor Main PCB.
Incorrect installation of indoor to outdoor control wire
Electromagnetic interference
Indoor or outdoor PCB faulty
Remove interference or
Remove interf r r erence or
Yes add magnet ring on power
add magnet ring on power
Adopt shield cable/shield
Adopt shield cable/shield
No
Yes Replace the signal wire
Replace the signal wire
No Pull out and insert back
Pull out and insert back
wire
wire
cable grounding
04.2020 | Bosch Thermotechnology Corp.
Service Manual