Fig. 206; Fig. 207; Fig. 208; Fig. 209 Dp42 Fuel Pump - Webasto Thermo Pro 90 Series Service Installations

Thermo Pro 90
2.5 Exhaust gas temperature sensor
Fig. 206 Exhaust gas temperature sensor
The exhaust gas temperature sensor detects the flame as well
as impermissible exhaust temperatures.
2.6 U4840 coolant pump
Fig. 207 U4840 coolant pump
The coolant pump pumps the coolant in the vehicle and
heater circuits. The pump is switched on by the control unit
and runs continuously during heater operation (also during
the pause and afterrunning phases as well as during residual
heat utilization).
2.7 Control unit
Fig. 208 Control unit
The control unit controls the functional sequence and moni-
toring of burner operation.
2.8 DP42 fuel pump

Fig. 209 DP42 fuel pump

The DP42 fuel pump supplies fuel to the heater.
ATTENTION
• The fuel pump must not be operated with the operating
voltage (12 or 24 ).
• Power must not be supplied to the pump when a control
unit is connected.
The fuel pump serves as a shut-off system when the heater is
switched off.
2 General description
203