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Heater does not function
Does the light on
the
on/off switch flash?
Yes
Is the diagnostics
light on the control
box flashing?
Yes
Count the number
of flashes
1
2
Mikuni MX40 Troubleshooting flow chart
Check that the
No
timer thermostat (If
fitted) is turned up
Yes
Check that the
No
12/24V
supply to the
heater is O.K
Yes
Suspect Control
box
3
4
Heater starts
No
ignition
cycle?
No
5
6
Yes
Problem solved
7
8
9
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Summary of Contents for Mikuni MX40
- Page 1 Mikuni MX40 Troubleshooting flow chart Heater does not function Does the light on Check that the Heater starts timer thermostat (If ignition Problem solved on/off switch flash? fitted) is turned up cycle? Check that the Is the diagnostics 12/24V light on the control...
- Page 2 Mikuni MX40 Troubleshooting flow chart Control box: '1' flash - Indicating 'Ignition failure' Does the water Replace control pump Does heater start? Problem solved start? Does the air motor Does the air motor start after approx Replace 7.5A fuse Replace air motor...
- Page 3 Mikuni MX40 Troubleshooting flow chart Control box: '2' flashes - Indicating 'flame sensor failure' Replace wiring Is the wiring loom Does the heater loom Problem solved all o.k? operate? (see note) Replace flame sensor Does the heater Problem solved start?
- Page 4 Mikuni MX40 Troubleshooting flow chart Control box: '3' flashes - Indicating 'thermistor failure' Replace wiring Is the wiring loom Does the heater loom Problem solved all o.k? operate? (see note) Replace thermistor Does the heater Problem solved start? Contact authorised...
- Page 5 Mikuni MX40 Troubleshooting flow chart Control box: '4' flashes - Indicating 'Waterpump failure' Replace wiring Is the wiring loom Does the heater loom Problem solved all o.k? operate? (see note) Replace 3 amp fuse Does the heater Does the heater Replace water start &...
- Page 6 Mikuni MX40 Troubleshooting flow chart Control box: '5' flashes - Indicating 'Air motor failure' Replace wiring Is the wiring loom Does the heater loom Problem solved all o.k? operate? (see note) Replace the 7.5A fuse Does the heater Replace the air...
- Page 7 Mikuni MX40 Troubleshooting flow chart Control box: '6' flashes - Indicating 'fuel pump failure' Replace wiring Is the wiring loom Does the heater loom Problem solved all o.k? operate? (see note) Replace Control Does the heater Does the heater Contact authorised...
- Page 8 Mikuni MX40 Troubleshooting flow chart Control box: '7' flashes - Indicating 'glow plug failure' Replace glow plug Is the glow plug Does the heater wiring loom Problem solved wiring all o.k? operate? (see note) Replace glow plug Does the heater...
- Page 9 Mikuni MX40 Troubleshooting flow chart Control box: '8' flashes - Indicating 'High or low voltage' Is the vehicle/boat Does the heater Charge batteries Problem solved battery charged? operate? Check supply cables to heater Does the heater Replace control Does the heater...
- Page 10 Mikuni MX40 Troubleshooting flow chart Control box: '9' flashes - Indicating 'Overheating failure' Fill system and Is the system full bleed Does the heater Problem solved of coolant radiators/matrix operate? heaters Check for damaged/ kinked pipes Does the heater Problem solved...
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