Operating instructions

2.2 Switching Off
When heating is no longer required, switch the Webasto heater off.
The solenoid valve interrupts the fuel supply, combustion stops and
the indicator light turns off. The Combustion air fan and the water
pump remain on for another 2-3 minutes (after run cycle) purging the
combustion chamber of any fumes.
2.3 Engine Pre-heating
1. Set the timer 30 min. to 1 hr. before you want to start engine. The
heater will start up at set time. (See timer operating instructions
beginning on page 203).
Or switch the toggle switch or “instant on” switch on your timer in
the vehicle dash to “ON”. The heater will start up.
2. When time is elapsed on your timer or engine preheat is no longer
required, switch the Webasto heater “OFF”. The heater will go
through the after-run cycle.
2.4 Boost Heating for Engine and Passenger
Compartment
1. Switch the toggle switch (or the “instant on” button of the timer) in
the vehicle dash to “ON”. The heater will heat the coolant to a
temperature of 185°F (85°C). Above this temperature only the
water pump will run.
2. When boost heating is no longer required, switch the Webasto
heater “OFF”. The heater will begin a brief after-run (cool-down)
cycle.
2.5 Operation with 7-Day Digital Timer Model 1531
The “Digital Timer with 3 time settings” permits the Webasto heater to
be switched on and off instantly, or automatically at 3 programmable
starting times.
The operating time of the heater can be pre-selected.
It is possible to program 3 different heating programs according to
your individual needs.
Only one preset starting time can be activated at any one time.
When the vehicle’s ignition is switched on, the current time of the day
and the day of the week are displayed.
NOTE
Restarting the Webasto
during the after-run period
is allowed.
2 Operating your Webasto Heater Thermo 230/300
202