Mikuni MX40 Guía

Does the light on

the

off switch flash

Check that the

timer thermostat

(

fitted

)

is turned up

Yes

Heater starts

ignition

cycle

Problem solved

Yes

Is the diagnostics

light on the control

box flashing

Check that the

supply to the

heater is O

Suspect Control

box

Count the number

of flashes

Yes

Mikuni MX

Troubleshooting flow chart

Heater does not function

21 456789

Does the water

pump

start

Replace control

box

Problem solved

Does heater start

Yes

Does the air motor

start after approx

seconds

Does the fuel pump

click

Yes

Replace

7.5

A fuse

Does the air motor

operate

Replace air motor

Replace fuel pump

Does the fuel pump

click

When fuel primes

problem should be

solved

Yes

Does combustion

start

(

roar from exhaust

)

Yes

Does heater start

but fails after

attempts

Check that fuel is

present

Does the heater

now start and run

Problem solved

Yes

Clean the flame

sensor

(

see note

)

Does the heater

now

start and run

Problem solved

Yes

Contact an

authorised

dealer

Mikuni MX

Troubleshooting flow chart

Control box

flash -

Indicating

'Ignition failure'

Mikuni MX

Troubleshooting flow chart

Control box

flashes

Indicating

'flame sensor failure'

Is the wiring loom

all o

.k?

Replace wiring

loom

(

see note

)

Does the heater

start

Yes

Does the heater

operate

Problem solved

Yes

Replace flame

sensor

Contact authorised

dealer

Problem solved

Yes

Mikuni MX

Troubleshooting flow chart

Control box

flashes

Indicating

thermistor failure

Is the wiring loom

all o

.k?

Replace wiring

loom

(

see note

)

Does the heater

start

Yes

Does the heater

operate

Problem solved

Yes

Replace thermistor

Contact authorised

dealer

Problem solved

Yes

Mikuni MX

Troubleshooting flow chart

Control box

flashes

Indicating

Waterpump failure

Is the wiring loom

all o

.k?

Replace wiring

loom

(

see note

)

Does the heater

start

Yes

Does the heater

operate

Problem solved

Yes

Replace

amp fuse

Bleed radiators

or matrix heaters

Replace water

pump

Yes

Does the heater

start

cycle

correctly

Problem solved

Yes

Is the water primed

Does the heater

start

cycle

correctly

Problem solved

Yes

Contact an

authorised

dealer

Yes

Mikuni MX

Troubleshooting flow chart

Control box

flashes

Indicating

Air motor failure

Is the wiring loom

all o

.k?

Replace wiring

loom

(

see note

)

Does the heater

start

Yes

Does the heater

operate

Problem solved

Yes

Replace the

7.5

fuse

Contact authorised

dealer

Replace the air

motor

Yes

Does the heater

run OK

Problem solved

Yes

Does the heater

run correctly

Problem solved

Yes

Mikuni MX

Troubleshooting flow chart

Control box

flashes

Indicating

fuel pump failure

Is the wiring loom

all o

.k?

Replace wiring

loom

(

see note

)

Does the heater

start

Yes

Does the heater

operate

Problem solved

Yes

Replace Control

box

Problem solved

Replace fuel pump

Yes

Does the heater

operate correctly

Contact authorised

dealer

Yes

Mikuni MX

Troubleshooting flow chart

Control box

flashes

Indicating

'glow plug failure'

Is the glow plug

wiring all o

.k?

Replace glow plug

wiring loom

(

see note

)

Does the heater

start

Yes

Does the heater

operate

Problem solved

Yes

Replace glow plug

Problem solved

Replace control

box

Yes

Does the heater

start

Contact authorised

dealer

Mikuni MX

Troubleshooting flow chart

Control box

flashes

Indicating

High or low voltage

Is the vehicle

boat

battery charged

Charge batteries

Does the heater

start

Yes

Does the heater

operate

Problem solved

Yes

Check supply

cables

to heater

Contact authorised

dealer

Replace control

box

Yes

Does the heater

now operate

Problem solved

Yes

Mikuni MX

Troubleshooting flow chart

Control box

flashes

Indicating

Overheating failure

Is the system full

of coolant

Fill system and

bleed

radiators

matrix

heaters

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

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