Webasto DUAL TOP RHA-100 Workshop Manual - page 11
Dual Top
3 Fault code output
303
Note:
n/a = not available
07
Overheating or exceeding gradient hot air
temperature sensor
1 Ensure that hot air can flow freely, air intake and
outlets are not blocked.
Reset heater (by switching off for at least 5 sec.)
2 Check fuel pump cable and connectors.
3 Check internal wiring harness connections Y9, Y10.
4 Check correct assembly of hot air temperature sensor.
08
Overheating of heaters' control unit
Ensure that cooling air can flow freely,
reset heater (by switching off for at least 5 sec.)
09
Combustion air motor fault: disconnection /
short circuit / overload / blocked
1 Ensure that cooling fan can freely rotate,
remove possible blocking objects.
2 Check fuse 15 A.
3 Check connector Y1 at control unit.
4 Change Drive Assy.
10
Control unit fault / heater locked
1 Put heater back into service (see beginning of this
section) and restart heater.
2 Replace control unit.
11
Interior temperature sensor disconnection or
short circuit
1 Check routing of cable, ensure that it is not pinched or
crushed,
check the connector behind the control panel.
Reset heater (by switching off for at least 5 sec.)
2 Replace interior temperature sensor.
12
Hot air temperature sensor disconnection /
short circuit
1 Check routing of cable, ensure that it is not pinched or
crushed, check the connectors.
2 Check resistance of hot air temperature sensor.
3 Reset heater (by switching off for at least 5 sec.)
4 Replace sensor wiring harness.
13
Water temperature sensor disconnection /
short circuit
1 Check routing of cable, ensure that it is not pinched or
crushed, check the connectors.
2 Check resistance of water temperature sensor.
3 Reset heater (by switching off for at least 5 sec.)
4 Replace sensor wiring harness.
14
Glow plug / flame detector disconnection /
short circuit
1 Check routing of cable, ensure that it is not pinched or
crushed, check the connectors.
2 Check resistance of glowplug.
3 Reset heater (by switching off for at least 5 sec.)
4 Replace burner (incl. glowplug and evaporator
housing assy).
15
Early flame detection
See fault message 14.
16
n/a n/a
17
Electrical safety/drain valve disconnection /
short circuit
1 Check routing of cable, ensure that it is not pinched or
crushed, check the connectors.
2 Check function of solenoid valve with separate
12V DC power supply.
3 Reset heater (by switching off for at least 5 sec.)
4 Replace solenoid valve.
Table 301: Fault messages manual Control Panel
Number of
RED flashes
Meaning
Remedy