Webasto RHA 100 heater

[janstevecairns]

Hi,has anyone had any problems with the heater blower on the Webasto RHA 100. Dualtop, its fitted on a Chausson Welcome 35.
I have checked all the fuses and all connections appear good.
Fault code comes up with 5 red flashes which indicates a heater blower fault.
Any ideas before i spend out on a new blower?

 

[Nesting Zombie]

Try a re set from the control panel.

 

[Deleted member 5816]

Try the heater with the engine running.

Alf

 

[janstevecairns]

Yep tried all them,also if in frost free the blower should turn slow but it does not.
Have spoken with Webasto Tech helpline so looks like i'll have to get under van remove end cap and take blower out and test.

 

[janstevecairns]

Got the blower off very easy provided there is room to remove end cap, can see that on motor power module the circuit board is pretty much corroded on the back has probably been subjected to moisture.
Getting motor checked to see if the motor is ok will try and clean up circuit board if not new motor unfortunately.

 

[janstevecairns]

Webasto Dual Top RHA100 Heater Blower

This is what happens when moisture gets onto the heater blower Pwm circuit board on a Webasto Dual Top Rha 100 heater.
The older blowers had the circuit board attached to the bottom of the blower with the back of the board facing upwards this allowed condensation from the two metal water pipes directly above to drip onto the circuit board.
The updated blower now has the pwm circuit board on the side which stops water collecting on the board surface.

 

[janstevecairns]

Webasto Heater Blower

Here's the circuit board removed from the blower.

 

[janstevecairns]

Blower now fitted easy job lovely warm van now.