Webasto airtop fault code

[Csail]

Can't find the manual but i think it was flashing 5 slow then rapid flashes.Any ideas?
From memory i think its electrics but not sure.

 

[Ex-SolentBoy]

Can't find the manual but i think it was flashing 5 slow then rapid flashes.Any ideas?
From memory i think its electrics but not sure.

You need to do some flashes counting.
Extract from the manual is below.
The five is just a warning.
The number of rapids indicates the fault.

Most are remedied by turning the thing off for 5 minutes and trying again. Especially if it has not been used for some time.


"Self-Diagnostic System (Reading Flash Codes)
A flash code will be generated on the indicator light of the control element. These flash codes indicate a
malfunction and subsequent operational interruption. There are up to ten codes available depending on
the nature of the malfunction and the heater model (see Table 2).
In order to make a correct analysis, it is necessary to understand the flash code event. The flash code
pertains to the control element (switch) only. The flash code is only visible during the after-run (cooldown)
period of operation (an optional timer will hold the last code in memory until corrected, see “F”
codes in parentheses on Table 2).

During the flash code event, you will see five quick flashes followed by a slower sequence of flashes from
one flash up to ten flashes. The slower sequence of flashes is the actual malfunction code. The five quick
flashes are only an indication that a malfunction has been detected and that the code will be displayed.
Count only the slower sequence of flashes to obtain the current malfunction code.
For example ( = one flash):
Event code 4X (F 04): ... ... ... ...
The fast/slow sequence will be repeated until the heater completes the after-run (cool-down) cycle after
which, the code will be stored in the control unit memory.

No Function Electrical wiring, fuses
Control unit
Fuses, battery connections
Power at red wire, ground at brown wire
Control unit malfunction

1X Flash (F 01)
No start after 2 start
attempts No flame-up
Fuel system
Combustion air
Burner
Fuel level - No fuel - Fuel system not primed
Type of fuel being used
Plugged fuel filter - replace
Fuel line connections and clamps loose
Air intake or exhaust - restricted or plugged
Clean or replace burner unit

2X Flashes (F 02)
Flame-out during
operation
Fuel supply (shortage)
Burner
Restriction in fuel system
Plugged fuel filter - replace
Fuel line connections and clamps loose
Type of fuel being used
Clean or replace burner unit

3X Flashes (F 03)
Low or over voltage for
more than 20 seconds
Electrical system Load test batteries
Corrosion at connections
Loose connections

4X Flashes (F 04)
Premature flame
detection
Defective flame sensor
Defective flame sensor/
glow pin
Replace flame sensor - Air Top 2000 S only
Replace flame sensor/glow pin - Air Top 3500/5000
only

5X Flashes (F 05)
(Air Top 2000 S Only)
Flame sensor
Wiring
Defective flame sensor
Damaged or corroded wiring, open or short circuit
Replace flame sensor

6X Flashes (F 06)
Temperature sensor
Wiring
Defective temp. sensor
Damaged or corroded wiring, open or short circuit
Replace temperature sensor

7X Flashes (F 07)
Fuel metering pump
Wiring
Defective fuel pump
Damaged or corroded wiring, open or short circuit
Replace fuel pump

8X Flashes (F 08)
Combustion air fan
Wiring
Wrong RPM
Defective fan motor
Damaged or corroded wiring, open or short circuit
Replace combustion air fan
Replace combustion air fan

9X Flashes (F 09)
Glow pin
(Ceramic igniter)
Wiring
Defective glow pin
Defective flame sensor/
glow pin
Damaged or corroded wiring, open or short circuit
Replace glow pin - Air Top 2000 S only
Replace flame sensor/glow pin - Air Top 3500/5000
only

10X Flashes (F 10)
Overheating
Overheating
Air flow
Wiring
Defective temp. limiter
Switch heater off and back on (see air flow)
Motor/fan obstruction, heating air flow blocked
Damaged or corroded wiring, open or short circuit
Replace temperature limiter

11X Flashes (F 11)
(Air Top 3500/5000 Only)
Temperature limiter
Wiring
Defective temp. limiter
Damaged or corroded wiring, open or short circuit
Replace temperature limiter

12X Flashes (F 12)
(Air Top 3500/5000 Only)
Control element
Wiring
Defective control element
Damaged or corroded wiring, open or short circuit
Replace control element