Error Codes - Mitsubishi Electric ecodan ECOSLIM150L-PP-MEUK Installation Manual

Error Codes

27
Error Codes
Code Error
L3 Circulation water temperature overheat protection
L4 DHW tank water temperature overheat protection
L5 Indoor unit temperature thermistor failure *
L6 Circulation water freeze protection
L8 Heating operation error
L9 Low primary circuit flow rate detected by flow switch *
LC Boiler circulation water temperature overheat protection
LD Boiler temperature thermistor failure *
LE Boiler operation error
LH Boiler circulation water freeze protection
LL Settings errors of DIP switches on FTC4 control board
J0 Communication failure between FTC4 and wireless receiver
P1 Room temperature thermistor failure *
P2 Refrigerant temperature thermistor failure *
P6 Antifreeze protection of plate heat exchanger
J1-J8 Communication failure between wireless receiver and
wireless remote controller
J9 Communication failure between main controller and
FTC4 slave board
E0–E5 Communication failure between main controller and
FTC4 master board
E6–EF Communication failure between FTC4 and outdoor unit
E9 Outdoor unit receives no signal from outdoor unit
U*, F* Outdoor unit error
Pre-Plumbed Slimline Cylinder Installation Manual
66
Action
Flow rate may be reduced check for:
• Water leakage
• Blocked strainer
• Water circulation pump function
Check immersion heater and its
contactor
Check resistance across thermistor
1
See action for L3
Re-attach any thermistors that have
become dislodged
1 See action for L3, check DIP switches,
replace flow switch
Check that target temperature of boiler
exceeds the restriction (See manual for
thermistors PAC-TH011HT-E)
See action for L3
Check resistance across thermistor
1
See action for L8. Check status of
the boiler
See action for L3
For boiler operation check that DIP
SW1-1 is set to ON and DIP SW2-6 is set
to ON. For 2 zone control, check that DIP
SW2-6 and SW 2-7 are set to ON.
Check connection cable for damage
or loose connections
Check resistance across thermistor
1
1 Check resistance across thermistor
See action for L3
Check remote controller battery, check
pairing between remote controller and
receiver, test the wireless connection
Check connection cable for damage or
loose connections
Check connection cable for damage or
loose connections
Check outdoor unit is not turned off,
check connection cable for damage or
loose connections, refer to outdoor
unit service manual
Check both units are switched on,
Check connection cables for damage
or loose connections, refer to outdoor
unit service manual
Refer to outdoor unit service manual