Volvo FM Handbook page 342

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Delete the settings by entering menu "P-heater timer"
and selecting "Zero".
11 Set the temperature with the thermostat.
The green indicator lamp lights up when the heater is
switched on.
Turning off the heater
Hold the switch in until the LED in the switch goes
out.
The heater is also switched off when the engine is
started and when the cooling fluid temperature has
become sufficiently high.
Automatic cut-off
The heater is switched off automatically when
• the flame goes out during operation and does not
relight within 90 seconds
• the heater overheats
• the voltage drops below 20 V or increases above 30
V
If the heater stops while running, or will not start at all,
check the following:
• fuses
• fuel level in the fuel tank
• underpressure in the fuel tank
• that the air circulation is not blocked
Cab 331
Note!
The use of biofuel reduces the life of
the heater and fuel pump, while
increasing the need for servicing by
up to 10 times.
J8008250
J8008457

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