Mikuni MX40 Guida
Does the light on
the
on
/
off switch flash
?
Check that the
timer thermostat
(
If
fitted
)
is turned up
No
Yes
No
Heater starts
ignition
cycle
?
Problem solved
Yes
Yes
No
Is the diagnostics
light on the control
box flashing
?
Check that the
12
/
24
V
supply to the
heater is O
.K
No
Suspect Control
box
Count the number
of flashes
Yes
Yes
Mikuni MX
40
Troubleshooting flow chart
Heater does not function
3
21 456789
No
Does the water
pump
start
?
Replace control
box
Problem solved
Does heater start
?
No
Yes
Yes
Does the air motor
start after approx
40
seconds
?
Does the fuel pump
click
?
Yes
No
Replace
7.5
A fuse
Does the air motor
operate
?
Replace air motor
No
Replace fuel pump
No
Does the fuel pump
click
?
When fuel primes
problem should be
solved
Yes
Yes
Does combustion
start
?
(
roar from exhaust
)
Yes
Does heater start
but fails after
3
attempts
Check that fuel is
present
No
Does the heater
now start and run
?
Problem solved
Yes
No
Yes
Clean the flame
sensor
(
see note
)
Does the heater
now
start and run
?
Problem solved
Yes
No
Contact an
authorised
dealer
No
Mikuni MX
40
Troubleshooting flow chart
Control box
:
'1
'
flash -
Indicating
'Ignition failure'
Mikuni MX
40
Troubleshooting flow chart
Control box
:
'2
'
flashes
-
Indicating
'flame sensor failure'
Is the wiring loom
all o
.k?
Replace wiring
loom
(
see note
)
No
Does the heater
start
?
Yes
Does the heater
operate
?
Problem solved
Yes
Replace flame
sensor
Contact authorised
dealer
Problem solved
Yes
No
No
Mikuni MX
40
Troubleshooting flow chart
Control box
:
'3
'
flashes
-
Indicating
'
thermistor failure
'
Is the wiring loom
all o
.k?
Replace wiring
loom
(
see note
)
No
Does the heater
start
?
Yes
Does the heater
operate
?
Problem solved
Yes
Replace thermistor
Contact authorised
dealer
Problem solved
Yes
No
No
Mikuni MX
40
Troubleshooting flow chart
Control box
:
'4
'
flashes
-
Indicating
'
Waterpump failure
'
Is the wiring loom
all o
.k?
Replace wiring
loom
(
see note
)
No
Does the heater
start
?
Yes
Does the heater
operate
?
Problem solved
Yes
Replace
3
amp fuse
Bleed radiators
or matrix heaters
Replace water
pump
Yes
No
No
Does the heater
start
&
cycle
correctly
?
Problem solved
Yes
No
Is the water primed
OK
?
No
Does the heater
start
&
cycle
correctly
?
Problem solved
Yes
Contact an
authorised
dealer
Yes
No
Mikuni MX
40
Troubleshooting flow chart
Control box
:
'5
'
flashes
-
Indicating
'
Air motor failure
'
Is the wiring loom
all o
.k?
Replace wiring
loom
(
see note
)
No
Does the heater
start
?
Yes
Does the heater
operate
?
Problem solved
Yes
Replace the
7.5
A
fuse
Contact authorised
dealer
Replace the air
motor
Yes
No
No
Does the heater
run OK
?
Problem solved
Yes
Does the heater
run correctly
?
Problem solved
No
No
Yes
Mikuni MX
40
Troubleshooting flow chart
Control box
:
'6
'
flashes
-
Indicating
'
fuel pump failure
'
Is the wiring loom
all o
.k?
Replace wiring
loom
(
see note
)
No
Does the heater
start
?
Yes
Does the heater
operate
?
Problem solved
Yes
Replace Control
box
Problem solved
Replace fuel pump
Yes
No
No
Does the heater
operate correctly
?
Contact authorised
dealer
No
Yes
Mikuni MX
40
Troubleshooting flow chart
Control box
:
'7
'
flashes
-
Indicating
'glow plug failure'
Is the glow plug
wiring all o
.k?
Replace glow plug
wiring loom
(
see note
)
No
Does the heater
start
?
Yes
Does the heater
operate
?
Problem solved
Yes
Replace glow plug
Problem solved
Replace control
box
Yes
No
No
Does the heater
start
?
Contact authorised
dealer
No
Mikuni MX
40
Troubleshooting flow chart
Control box
:
'8
'
flashes
-
Indicating
'
High or low voltage
'
Is the vehicle
/
boat
battery charged
?
Charge batteries
No
Does the heater
start
?
Yes
Does the heater
operate
?
Problem solved
Yes
Check supply
cables
to heater
Contact authorised
dealer
Replace control
box
Yes
No
No
Does the heater
now operate
?
No
Problem solved
Yes
Mikuni MX
40
Troubleshooting flow chart
Control box
:
'9
'
flashes
-
Indicating
'
Overheating failure
'
Is the system full
of coolant
Fill system and
bleed
radiators
/
matrix
heaters
No
Does the heater
now
cycle correctly
Yes
Does the heater
operate
?
Problem solved
Yes
Check for
damaged
/
kinked pipes
Contact authorised
dealer
Problem solved
Yes
No
No
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