T54.25-0030-01
1 Switch stationary heater on by operating switch (1) on instrument panel.
Move the switch upwards. The malfunction indicator lamps (2, 3) on the instrument panel and in the switch must illuminate.
T54.30-0034-01
2 Switch stationary heater off by operating the switch (1) again.
The malfunction indicator lamps (2, 3) must go off.
The coolant circulation pump and the combustion air blower must continue to run for approx. 2 minutes.