53
FAULT FINDING
F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING
IMAX XTRA EL
-
Installation & Servicing
0-10+
0-10-
DHW+
DHW-
OWC+
OWC-
OT+
OT-
PW
M
GND
INT
INT
LOCKOUT
LOCKOUT
BURNER ON
BURNER ON
N
L NO
L NC
N
L
L
N
LIVE OUT
CH CALL
LIVE OUT
DHW/CH2 CALL
HEAT
DEMAND
23
0v
50
Hz
MAINS
IN
230v
50Hz
DHW/
CH2
PUMP/
VALVE
CH/
BOI
LER
PUMP
VOLTS
FREE
CONTACTS
INTER/
LOCK
PUMP
CONTROL
0-10v
INPUT
TANK
SENSOR
OUTSI
DE
SENSOR
OPEN
THERM
switched
live
pump
control
0-10V
0 10
opentherm
master
- +
supply
69 0-10V INTERFACE
Set the boiler to accept a 0-10V input (see
Frame 23)
no
Is the boiler set to accept a 0-10V Input?
yes
yes
Set the boiler to Winter Mode (see Frame
21)
no
Is the boiler set to Winter Mode?
yes
yes
Ensure between 2V and 10V is correctly
connected to these terminals from the
external device
no
Is a voltage of between 2V and 10V being supplied to
(F), with positive and negative connected correctly?
yes
yes
Ensure that the wiring is securely
connected and has continuity
no
Is the wiring from the boiler terminal strip to the main
PCB securely connected and does it have continuity?
yes
yes
Replace main PCB
F
70 EXTERNAL INTERLOCK OFF
Is an External Interlock connected to the boiler?
yes
Has the External Interlock operated?
no
Does the wiring from the Interlock Relay (mounted
within the boiler) to the terminal strip have continuity and
is it securely connected?
Replace the Interlock Relay Kit
Ensure that a link wire is securely connected
across the terminals marked “External
Interlock” in the boiler terminal strip
no
Reset the External Interlock
yes
Ensure the wiring has continuity and is
securely connected
no
yes