Nibe VVM 310 User manual

Service manual
APH
NIBE™ VVM 310
Indoor module
SEM GB 1451-1
M11741

Table of Contents
21 Important information
2Document information
2Safety information
52 Indoor module's design
5VVM 310
6Pipe connections
6HVAC components
6Sensors etc.
6Electrical components
6Miscellaneous
73 System description
7Principle of operation
8System diagram
94 Current circuit
9Load monitor
105 Component description
10Components
12Sensors
13Electronics
156 Troubleshooting
15Alarm list
23Troubleshooting guide
28Function check, components
307 Component replacement
30Basic
33Main components
44Circuit board and electronics
478 Technical data
47Dimensions and setting-out coordinates
48Technical specifications
49Hot water capacity
50Index
1Table of Contents |NIBE™ VVM 310

Document information
This technical manual is a complement to the Installer
handbook for VVM 310, containing:
■Component description.
■Information to facilitate fault-tracing.
■Instructions for replacing components.
■Wiring diagram.
■Supplementary technical information.
The document applies to VVM 310 with software ver-
sions up to and including v4272R5.
The heat pump software version can be found in the
info menu (menu 3.1).
Safety information
This manual describes installation and service proced-
ures for implementation by specialists.
This appliance can be used by children
aged from 8 years and above and per-
sons with reduced physical, sensory or
mental capabilities or lack of experience
and knowledge if they have been given
supervision or instruction concerning
use of the appliance in a safe way and
understand the hazards involved. Chil-
dren shall not play with the appliance.
Cleaning and user maintenance shall
not be made by children without super-
vision.
Rights to make any design or technical
modifications are reserved.
©NIBE 2014.
Symbols
NOTE
This symbol indicates danger to machine or
person.
Caution
This symbol indicates important information
about what you should observe when main-
taining your installation.
TIP
This symbol indicates tips on how to facilitate
using the product.
Marking
The CE marking means that NIBE ensures that the
product meets all regulations that are placed on it
based on relevant EU directives. The CE mark is obligat-
ory for most products sold in the EU, regardless where
they are made.
NIBE™ VVM 310Chapter 1 | Important information2
1 Important information

Serial number
The serial number can be found at the bottom right of
the front cover and in the info menu (menu 3.1).
Serial number
Caution
Always give the product's serial number (14
digits) when reporting a fault.
3Chapter 1 | Important informationNIBE™ VVM 310

Contact information
KNV Energietechnik GmbH, Gahberggasse 11, 4861 SchörflingAT
Tel: [phone] Fax: [phone] E-mail: [e-mail] www.knv.at
NIBE Wärmetechnik AG, Winterthurerstrasse 710, CH-8247 FlurlingenCH
Tel: [phone] Fax: [phone] E-mail: [email protected] www.nibe.ch
Druzstevni zavody Drazice s.r.o, Drazice 69, CZ - 294 71 Benatky nad JizerouCZ
Tel: [phone] Fax: [phone] E-mail: [email protected] www.nibe.cz
NIBE Systemtechnik GmbH, Am Reiherpfahl 3, 29223 CelleDE
Tel: [phone] Fax: [phone] E-mail: [email protected] www.nibe.de
Vølund Varmeteknik A/S, Member of the Nibe Group, Brogårdsvej 7, 6920 VidebækDK
Tel: [phone] Fax: [phone] E-mail: [email protected] www.volundvt.dk
NIBE Energy Systems OY, Juurakkotie 3, 01510 VantaaFI
Puh: 09-274 697 0 Fax: [phone] E-mail: inf[email protected] www.nibe.fi
NIBE Energy Systems France Sarl, Zone industrielle RD 28, Rue du Pou du Ciel, 01600 ReyrieuxFR
Tel : [phone] Fax : [phone] E-mail: [email protected] www.nibe.fr
NIBE Energy Systems Ltd, 3C Broom Business Park, Bridge Way, Chesterfield S41 9QGGB
Tel: [phone] Fax: [phone] E-mail: [email protected].uk www.nibe.co.uk
NIBE Energietechniek B.V., Postbus 634, NL 4900 AP OosterhoutNL
Tel: [phone] Fax: [phone] E-mail: [email protected] www.nibenl.nl
ABK AS, Brobekkveien 80, 0582 Oslo, Postadresse: Postboks 64 Vollebekk, 0516 OsloNO
Tel. sentralbord: [phone] E-mail: [email protected] www.nibeenergysystems.no
NIBE-BIAWAR Sp. z o. o. Aleja Jana Pawła II 57, 15-703 BIAŁYSTOKPL
Tel: [phone] Fax: [phone] E-mail: [e-mail] www.biawar.com.pl
© "EVAN" 17, per. Boynovskiy, Nizhny NovgorodRU
Tel./fax [phone] E-mail: [email protected] www.nibe-evan.ru
NIBE AB Sweden, Box 14, Hannabadsvägen 5, SE-285 21 MarkarydSE
Tel: [phone] Fax: [phone] E-mail: [email protected] www.nibe.se
For countries not mention in this list, please contact Nibe Sweden or check www.nibe.eu for more information.
NIBE™ VVM 310Chapter 1 | Important information4

VVM 310
Wilo
Wilo
VVM 310
AA3
QM1
EB1
FD1
FA1
GP1
QM20
AA2
SF1
UB1
AA4-XJ4
AA4
AA4-XJ3
GP12
BT63
UB2
BF1*
BT6
BT54
XL30
AA7
XL18
XL3XL4 XL9
XL8
XL19
QN11QN10
BT7
PF3
PF1
AA1-X3
BT30
AA1-X7
AA1-SF1
AA1
AA3-X4
BP5 QN35
UB1
UB2
K1
PF3
XL1
XL2
BT3
BT2
W130
5Chapter 2 | Indoor module's designNIBE™ VVM 310
2 Indoor module's design

Pipe connections
Connection, heating medium flow line G20 int.XL1
Connection, heating medium return line G20
int.
XL2
Connection, cold water G20 int.XL3
Connection, hot water G20 int.XL4
Connection, docking in heating medium G20
int.
XL8
Connection, docking out heating medium G20
int.
XL9
Connection, docking in high temp Ø22 mmXL18
Connection, docking out high temp Ø22 mmXL19
Connection, expansion vesselXL30
HVAC components
Circulation pumpGP1
Charge pumpGP12
Drain valve, heating mediumQM1
Mixing valve, additionQN11
Venting, climate systemQM20
Reversing valve, climate system/water heating,
flow line
QN10
Reversing valve, climate system/water heating,
return line
QN35
Sensors etc.
Manometer, heating systemBP5
Temperature sensor, heating medium flow (not
visible in image)
BT2
Temperature sensor, heating medium return
(not visible in image)
BT3
Temperature sensor, hot water, chargingBT6
Temperature sensor, hot water, topBT7
Thermostat, standby modeBT30
Temperature sensor, external dockingBT54
Temperature sensor, heating medium supply
after immersion heater
BT63
Electrical components
Immersion heater cardAA1
AA1-SF1 Switch
AA1-X3 Terminal block, immersion heater
AA1-X7 Terminal block, immersion heater
Base cardAA2
Input circuit boardAA3
AA3-X4 Terminal block, current sensors
Display unitAA4
AA4-XJ3 USB socket
AA4-XJ4 Service socket
Extra relay circuit boardAA7
Energy meter*BF1*
Immersion heaterEB1
Miniature circuit-breakerFA1
Temperature limiterFD1
Auxiliary relay, emergency mode.K1
SwitchSF1
Miscellaneous
Rating platePF1
Serial number platePF3
Cable glandUB1
Cable glandUB2
Network cable for NIBE UplinkW130
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
*Only available as accessory EMK 310.
NIBE™ VVM 310Chapter 2 | Indoor module's design6

Principle of operation
XL8 XL9 CM1 XL3 XL2
XL1XL4BT7XL39
BT2
GP1
BT3
GP12
QN10
QN35
QN11
BT6
BT54
XL2
XL9
QN35
XL3
GP12
QN10
BT3
GP1
BT2
XL8
XL4
CM1
QN11
XL1
BT6
BT54
BT7
XL39
List of components
Pipe connections
Connection, heating medium flow lineXL1
Connection, heating medium return lineXL2
Connection, cold waterXL3
Connection, hot waterXL4
Connection, docking in heating mediumXL8
Connection, docking out heating mediumXL9
Connection, docking poolXL39
HVAC components
Expansion tank (connection)CM1
Circulation pumpGP1
Charge pumpGP12
Shuttle valve, climate system/water heater, flow
line
QN10
Shunt valveQN11
Shuttle valve, climate system/water heater, re-
turn line
QN35
Sensors
Temperature sensors, heating medium flowBT2
Temperature sensors, heating medium returnBT3
Temperature sensor, hot water, controlBT6
Temperature sensor, hot water, displayBT7
Temperature sensor, solar coilBT54
7Chapter 3 | System descriptionNIBE™ VVM 310
3 System description

System diagram
-CP10
-BT64 -QN12
-AA5
-EQ1
-GP13
-GP12
-EB101
-EB15
-FL2
-CM1
-EB100
-FL10
-QM41
-QM40
-QN50
POOL
-GP9 -BT51 -HQ4
-EP5
-AA5
-CL11
POOL
-CL11
-CL11
-QN19
-CL11
-GP12
-GP20
-BT3
-BT2
-QN11
-EP21
-AA5
-GP9
-BT52
-EM1
-AA5
-EM1
-GP15
-BT52
-AA5
-GP15
-EB1
-EP30
-EP30-BT53
-EP8
-AA25
-CM5
-GP4
-QM45
-RM3
-QM43
-QM44
T P
-FL4
-RM4 T
-GP30
-EP30
-EP30-BT53
-EP8
-AA25
-CM5
-GP4
-QM45
-RM3
-QM43
-QM44
T P
-FL4
-RM4 T
-GP30
-EP30
-EP30-BT53
-EP8
-AA25
-CM5
-GP4
-QM45
-RM3
-QM43
-QM44
T P
-FL4
-RM4 T
-GP30
Climate systemEP 21Accessory cardAA 5
Solar kit SCA 35EP 30Control unitAA 25
Safety valve, climate systemFL 2Temperature sensors, heating medium flowBT 2
Safety valve, solarFL 4Temperature sensors, heating medium returnBT 3
Circulation pump, solarGP 4Temperature sensor, poolBT 51
Circulation pump, poolGP 9Temperature sensor, boilerBT 52
Charge pumpGP 12
Circulation pump, external heat sourceGP 15Temperature sensor, solar panelBT 53
Circulation pumpGP 20Pool kit POOL 310CL 11
Pump station SPS 10, SPS 20GP 30Expansion vessel, heating mediumCM 1
Particle filterHQ 4Expansion vessel, solarCM 5
Shut-off valveQM 4XVVM 310EB 15
Shunt valveQN 11F2025/F2026/F2030/F2040EB 101
Three way valve, poolQN 19Oil, gas, or electric boilerEM 1
Non-return valveRM XExchanger, poolEP 5
Solar panelEP 8
NIBE™ VVM 310Chapter 3 | System description8

Load monitor
Currents sensors are connected on AA3-X4:1-4.
Function:
■If any of the internal phases exceed the set value and
the phase sequence is not detected, the power step
disconnects from one of the internal phases. Because
the phase sequence is not detected this can mean
that the incorrect phase sequence is disconnected,
so that the output is still too high. The heat pump
continues by disconnecting another phase, until the
current does not exceed the set value. If the current
still exceeds the set value when all internal phases
are disconnected, the same process is performed for
the external additional heat, if such exists and is set
to step controlled additional heat
NOTE
Do not disconnect the external additional
heat if it is set to give additional heat in one
step.
.
■If the phase sequence is detected the electrical out-
put is disconnected in the phase that exceeds the set
value. This will also handle any external additional
heat.
■If disconnecting the phases does not work, the heat
pump will finally disengage.
■Reconnection occurs when the current has fallen to
a value low enough to permit reconnection.
NOTE
VVM 310 must be filled with water before the
phase sequence is detected.
For the heat pump to disconnect the electrical output
in the correct phase, the phase sequence must have
been detected during the installation. In the menu
5.1.12 the phase sequence must be detected after-
wards. An unsuccessful detection may be due to the
current sensors not being correctly connected or that
other electrical equipment started or stopped during
detection.
Factory settingNameMenu
16Afuse size5.1.12
detect phase order
1-phase inverter stepping out:
Variant of load monitor designed to be used in in-
stances where 1-phase inverter compressors are used
together with 3-phase disconnectable additional heat.
Load monitor initially disconnects the immersion
heater's output.
If the electrical power still exceeds the set value the
compressor slows to 20 Hz per 30 seconds until the
electrical power falls below the set value.
9Chapter 4 | Current circuitNIBE™ VVM 310
4 Current circuit

Components
DescriptionComponent
Red coil (3 kW) resistance 55 ohmImmersion heater
(EB1) Black coil (0.5 kW), resistance 110 ohm
White coil (3x1333 W) resistance 39.59 ohm
Brown coil (3x2667 W) resistance 19.79 ohm
B
95±2
112 ±2
166,5 ±2
Ø28
50R ±5
799,5 ±7
(966)
25 ±1
390 ±2 353
Ø63,5
30
Ra3.2
0
0
0
0
1
3
2
Actuator motor: 7 VA, 230/24 VAC, 50 Hz, IP 40. Running time approx 8 sec.Reversing valve
(QN10, QN35) Max. operating pressure: 1.0 MPa
Operating temperature: 5 - 80 °C (90 °C briefly)
56 56 Ø28
30
54
106
142
Ø28
NIBE™ VVM 310Chapter 5 | Component description10
5 Component description

DescriptionComponent
E6PWM7-15/130G NIBEHeating medium
pump (GP1)
140,2 ± 3
112,2 ± 2
130
ISO 228/1-G1
and
Charge pump (GP12)
11Chapter 5 | Component descriptionNIBE™ VVM 310

Sensors
Data temperature sensor
Voltage (VDC)Resistance (kOhm)Temperature (°C)
3.256351.0-40
3.240251.6-35
3.218182.5-30
3.189133.8-25
3.15099.22-20
3.10574.32-15
3.04756.20-10
2.97642.89-5
2.88933.020
2.78925.615
2.67320.0210
2.54115.7715
2.39912.5120
2.24510.0025
2.0838.04530
1.9166.51435
1.7525.30640
1.5874.34845
1.4263.58350
1.2782.96855
1.1362.46760
1.0072.06865
0.8911.73970
0.7851.46975
0.6911.24680
0.6071.06185
0.5330.90890
0.4690.77995
0.4140.672100
0.2500.380120
0.1200.180150
NIBE™ VVM 310Chapter 5 | Component description12

Electronics
Immersion heater card (AA1)
IndicationLED
A steady light means that the relevant
relay is engaged.
K1 - K9: Or-
ange
FunctionOutput
Supply L1K1
Supply L2K2
Supply L3K3
Immersion heater EB1 2 kWK4
Not usedK5
Immersion heater EB1 2 kWK6
Immersion heater EB1 only at 3 kWK7
Immersion heater EB1 2 kWK8
Immersion heater EB1 1 kW or 3 kWK9
Base card (AA2)
IndicationLED
A steady light means that 12 V is OK.Power:
Green
Flashing once/sec. Indicates that the
processor is OK.
Run: Green
Flashes irregularly during communication.Com: Green
Continuous light during active output.PWM1: Or-
ange
Continuous light during active output.PWM2: Or-
ange
A steady light means that the relevant
relay is engaged.
K1 - K4: Or-
ange
Outputs
FunctionOutput
Control signal HM pump (GP1)PWM1
Control signal charge pump (GP12)PWM2
Reversing valve (QN10).K1
Charge pump (GP12).K2
Circ-pump (GP1).K3
FunctionOutput
No function.K4
Input circuit board (AA3)
FunctionInputs
Current sensor input (GND).X4-1
Current sensor input (BE1).X4-2
Current sensor input (BE2).X4-3
Current sensor input (BE3).X4-4
Outdoor sensor input (BT1).X6:1- 2
Room sensor input (BT50).X6:3-4
AUX1X6:9-10
AUX2X6:11-12
AUX3X6:13-14
AUX4X6:15-16
AUX5X6:17-18
FunctionOutput
Potential free relay CommonK1X7:1
Potential free relay NOK1X7:2
Potential free relay NCK1X7:3
Display unit (AA4)
The display unit consists of:
■a colour screen where all information is displayed.
■a status lamp.
■navigation buttons (OK button, Back button and
Control knob).
■a USB socket.
■a service socket.
FunctionStatus lamp
Normal functionLights green
Emergency mode activatedLights yellow
Alarm trippedLights red
13Chapter 5 | Component descriptionNIBE™ VVM 310

Extra relay circuit board (AA7)
IndicationLED
A steady light means that the relevant
relay is engaged.
K1 - K3: Or-
ange
FunctionOutput
Shunt valve close (QN11)K1
Shunt valve open (QN11)K2
Reversing valve (QN35)K3
NIBE™ VVM 310Chapter 5 | Component description14

Alarm list
A-alarm
In event of an A alarm the red lamp on the front lights and an alarm icon is displayed. First go through the suggested
actions shown in the display.
May be due toHeat pump action.CauseAlarm text on
the display
Alarm
no.
See fault-tracing schedule page
23.
Calculated flow temperature is
set to min supply line (menu
1.9.3).
Sensor not connected/defect-
ive
(outdoor sensor)
Sensor fault BT11
See fault-tracing schedule page
24.
Uses BT3 if available.
If BT3 is not available, BT63 is
used.
Sensor not connected/defect-
ive
(heating medium supply)
Sensor fault BT22
See fault-tracing schedule page
24.
No actionSensor not connected/defect-
ive
Sensor fault BT33
(heating medium return)
See fault-tracing schedule page
24.
Uses BT54Sensor not connected/defect-
ive
Sensor fault BT66
(hot water, controlling)
See fault-tracing schedule page
24.
Blocks internal electrical addi-
tion.
Sensor not connected/defect-
ive
Sensor fault
BT63
31
See fault-tracing schedule page
25.
Switches off solar function.Sensor not connected/defect-
ive
Sensor fault
EP30 - BT53
33
(solar panel)
See fault-tracing schedule page
25.
Switches off solar function.Sensor not connected/defect-
ive
Sensor fault
EP30 - BT54
34
(solar coil)
See fault-tracing schedule page
25.
Shunt closes. Burner stops.Sensor not connected/defect-
ive
Sensor fault
EM1 - BT52
35
(boiler)
See fault-tracing schedule page
25.
Controls the return sensor
(EP21-BT3)
Sensor not connected/defect-
ive
Sensor fault
EP21 - BT2
36
(supply temperature sensor,
extra climate system 1)
See fault-tracing schedule page
25.
Controls the return sensor
(EP22-BT3)
Sensor not connected/defect-
ive
Sensor fault
EP22 - BT2
37
(supply temperature sensor,
extra climate system 2)
See fault-tracing schedule page
25.
Controls the return sensor
(EP23-BT3)
Sensor not connected/defect-
ive
Sensor fault
EP23- BT2
38
(supply temperature sensor,
extra climate system 3)
See fault-tracing schedule page
25.
Shuts off cooling, Closes shunt
(QN18) for cooling.
Sensor BT64 not connected,
defective.
Sensor fault
EQ1–BT64
39
15Chapter 6 | TroubleshootingNIBE™ VVM 310
6 Troubleshooting

May be due toHeat pump action.CauseAlarm text on
the display
Alarm
no.
Motor protection on one
phase (Norway) machine has
probably blown.
45
Internal electrical addition is
blocked.
Temperature limiter has
tripped
The temperat-
ure limiter has
tripped
52
Check serial numberThe compressor stops, all relay
outputs are set to 0 V
Serial number and program
do not match
Incorrect pro-
gram
56
Compressor blocked.Serial number and program
do not match each other.
Incorrect pro-
gram
57
All relay outputs are set to 0 V.
See fault-tracing schedule on
page 26.
Blocking the relevant com-
pressor. Calculated flow temper-
ature is set to min supply line.
Communication with the in-
put card missing for 60 secs.
Communication
fault with PCA
input EB15
70
See fault-tracing schedule on
page 27.
Compressor (EB101) blocked.Communication with the base
card missing for 15 secs.
Communication
fault with PCA
base-AA2
71
- Check communication cablesAccessory is blocked.Communication with the ac-
cessory card missing for 15
secs.
Existing commu-
nication fault
with ”access-
ory".
73 -
95 - Check the setting of the
dipswitch.
- Check communication cablesAccessory is blocked.Communication with room
unit zone 1-4 missing for 60
secs.
Existing commu-
nication fault
with ”room
unit".
96 -
99
- Check the communication
cables.
Switches off step controlled
additional heat.
Communication with the ac-
cessory card missing for 15
secs.
Communication
fault ACC EB1.
208
- Check settings on the
dipswitch.
See relevant manual.Compressor blocked.See relevant manual.High pressure
alarm.
220
See relevant manual.Compressor blocked.See relevant manual.Low pressure
alarm.
221
See relevant manual.Compressor blocked.See relevant manual.Motor protec-
tion alarm.
222
See relevant manual.Compressor blocked.See relevant manual.Sensor fault.223
See relevant manual.Compressor blocked.See relevant manual.Fan alarm.224
See relevant manual.Compressor blocked.See relevant manual.Supply/return
line.
225
See relevant manual.Compressor blocked.See relevant manual.Sensor fault.227
See relevant manual.Compressor blocked.See relevant manual.Defrosting fault.228
NIBE™ VVM 310Chapter 6 | Troubleshooting16

May be due toHeat pump action.CauseAlarm text on
the display
Alarm
no.
See relevant manual.Compressor blocked.See relevant manual.Short operating
time.
229
See relevant manual.Compressor blocked.See relevant manual.Hot gas alarm.230
See relevant manual.Compressor blocked.See relevant manual.Phase sequence
fault.
231
See relevant manual.Compressor blocked.See relevant manual.Low evapora-
tion.
232
See IHB SMS40 for fault tracing.Accessory is blocked.Communication with the ac-
cessory card missing for 15
secs.
Communication
fault ACC
SMS40.
250
See IHB Modbus40 for fault
tracing.
Accessory is blocked.Communication with the ac-
cessory card missing for 15
secs.
Communication
fault ACC Mod-
bus40.
251
Faulty communication cableCompressor blocked.Communication with heat
pump missing.
Slave heat pump
1 comm fault.
252
See relevant manual.Compressor blocked.High VVX temp (E35)This alarm is
generated by
the heat pump
261
See relevant manual.Compressor blocked.Inverter fault, high temperat-
ure.
This alarm is
generated by
the heat pump
262
See relevant manual.Compressor blocked.Inverter error, high current
(E47)
This alarm is
generated by
the heat pump
263
See relevant manual.Compressor blocked.inverter error, com (E45)This alarm is
generated by
the heat pump
264
See relevant manual.Compressor blocked.inverter fault, pcb (E46)This alarm is
generated by
the heat pump
265
See relevant manual.Compressor blocked.Low refrigerant amount (E57)This alarm is
generated by
the heat pump
266
See relevant manual.Compressor blocked.Inverter error, start error (E59)This alarm is
generated by
the heat pump
267
See relevant manual.Compressor blocked.Inverter fault, convThis alarm is
generated by
the heat pump
268
See relevant manual.Compressor blocked.Sensor fault MHI exchange,
(E37)
This alarm is
generated by
the heat pump
277
17Chapter 6 | TroubleshootingNIBE™ VVM 310

May be due toHeat pump action.CauseAlarm text on
the display
Alarm
no.
See relevant manual.Compressor blocked.Sensor fault MHI ambient air,
(E38)
This alarm is
generated by
the heat pump
278
See relevant manual.Compressor blocked.Sensor fault MHI discharge,
(E39)
This alarm is
generated by
the heat pump
279
See relevant manual.Compressor blocked.Sensor fault MHI suction,
(E53)
This alarm is
generated by
the heat pump
280
See relevant manual.Compressor blocked.Sensor fault MHI LP, (E54)This alarm is
generated by
the heat pump
281
Check communication cablesAccessory is blocked.Temporary Comm. Fault Act-
ive 4-pipe cooling ULVP
Com. error Acc.
–EQ1
283
Check settings of the dipswitch
Check communication cables.Master blocks relevant com-
pressor. The compressors are
stopped on the slave.
Communication with the slave
missing for 15 secs.
Perm. comm. to
a slave unit -
EB102
301
See relevant manual.Compressor blocked.Sensor fault detected on the
slave Off Com-interface MHI-
EMMY
Sensor fault on
EB101
403
See relevant manual.Compressor blocked.Sensor fault detected on the
slave Off Com-interface MHI-
EMMY
Sensor fault on
EB101
404
See relevant manual.Compressor blocked.Sensor fault detected on the
slave Off Com-interface MHI-
EMMY
Sensor fault on
EB101-BT12
412
See relevant manual.Compressor blocked.Sensor fault detected on the
slave Off Com-interface MHI-
EMMY
Sensor fault on
EB101-BT15
415
NIBE™ VVM 310Chapter 6 | Troubleshooting18