Has anyone had problems with the FBH not starting correctly some times and
Causing the lockout fault.
I had this so replaced the heater cos I got one cheap,all was ok for a while.
Now it seems to be the same again ,sometimes it starts and runs fine,sometimes starts and cuts out causing the fault code and lockout. Follow Us On Twitter @bellautos

Low battery problems are a major cause !!!

Also these

The control module will not start the FFBH, or will discontinue operation, if any of the following occur:
�� The control module is in the lockout mode (see Diagnostics at the end of this section).
�� A crash message is received from the restraints control module.
�� A low fuel level message is received from the instrument cluster.
�� The battery voltage is too low. When starting the FFBH, battery voltage must be 10.25 - 15.5 volts. When the
FFBH is running, operation will be discontinued if battery voltage decreases to less than 10.25 volts. Bluetooth Exchange www.bluetoothexchange.co.uk

wiggs wrote:

Low battery problems are a major cause !!!

Also these

The control module will not start the FFBH, or will discontinue operation, if any of the following occur:
�� The control module is in the lockout mode (see Diagnostics at the end of this section).
�� A crash message is received from the restraints control module.
�� A low fuel level message is received from the instrument cluster.
�� The battery voltage is too low. When starting the FFBH, battery voltage must be 10.25 - 15.5 volts. When the
FFBH is running, operation will be discontinued if battery voltage decreases to less than 10.25 volts.

Thanks wiggs, i can iliminate the battery and the Restraint System , ill have to dig about a bit more, the heater does fire up as i can here it and then cuts out just af the fan kickis into high speed,it also fails the test on IDS

Its not low on diesel , or the low light is not on at least but may be it dont like it when below half a tank for some reason, ill fit it up and try again.

Regards Pete Follow Us On Twitter @bellautos

Doesen't like inclines either ....

 Bluetooth Exchange www.bluetoothexchange.co.uk

Thanks, I've just unpluged it to let it power down and I'll try and start it again in about 30 mins.

It's a weird one beacause I can iliminate all the things that should not be done and that would cause a start and then stop/fire gone out. Follow Us On Twitter @bellautos

Are you letting it go through its full starting sequence.

Takes just over 2 mins to fire up completly Bluetooth Exchange www.bluetoothexchange.co.uk

Yes. It does the ticking then fires and sounds ok
The just as the fan speeds up you here the flame/jet noise stop.
After that it runs for a bit with only the fan then stops totaly.

It is the same as it was with the old heater that was fitted,I thaught I'd cured it fitting this new one as it's been
ok for a few weeks now, untill the other day  Follow Us On Twitter @bellautos

Just thinking about it, I was going to go out the other day, I fired up the heater from the gsm timer all was ok I think.
A few mind later I decided not to go so I rang the gsm timer again to stop the heater could this have caused it do you think ? Follow Us On Twitter @bellautos

Could well have ...if it had not gone through its sequence and you stopped it ..it shuts down for a while to stop any serious faults .

Unfortunatly in the bumph ..its dosent say for how long  Bluetooth Exchange www.bluetoothexchange.co.uk

I think I've sussed it , I fired it up water for the fan to go to high speed just where it would normaly extinguish it's self and gave it some propane in the inlet pipe.
The fuel pump spead up ticking as tie should.

Took the propane away and it's still running
I recon my fuel pump is weak/slow on it's slow speed setting not giving eniough derv to keep it going when it needs it most. Follow Us On Twitter @bellautos

This may help

Diagnostics

The control module monitors the FFBH system for faults. Any faults detected are stored in a volatile memory in the control module, which can be interrogated by T4. A maximum of three faults and associated freeze frame data can be stored at any one time. If a further fault is detected, the oldest fault is overwritten by the new fault.

The control module also incorporates an error lockout mode of operation that inhibits operation to prevent serious faults from causing further damage to the system. In the error lockout mode, the control module immediately stops the auxiliary fuel pump, and stops the combustion air fan and circulation pump after a cool down time of approximately 2 minutes.

Error lockout occurs for start sequence failures, combustion flameouts, heat exchanger casing overheat and if battery voltage is out of limits. The error lockout mode can be cleared using T4, or by disconnecting the battery power supply (connector C0926) for a minimum of 10 seconds.

Start Failure and Flameout: If a start sequence fails to establish combustion, or a flameout occurs after combustion is established, the control module immediately initiates another start sequence. The start failure or flameout is also recorded by an event timer in the control module. The event timer is increased by one after each start failure or flameout, and decreased by one if a subsequent start is successful. If the event timer increases to three (over any number of drive cycles), the control module enters the error lockout mode.

Heat Exchanger Casing Overheat: To protect the system from excessive temperatures, the control module enters the error lockout mode if the heat exchanger coolant temperature exceeds 125 °C (257 °F).

Battery Voltage Limits: 10.25 - 15.5 volts. Bluetooth Exchange www.bluetoothexchange.co.uk

Thanks wiggs ,I think that must be it "flame out" and it cuts the fuel instead of trying to increase it for a second to try and recover the flameout.

I'll leave for this 30 min run and try again in the morning as normal.
If that don't work I'll have to try and locate a FBH fuel pump tomorrow.

Regards Pete Follow Us On Twitter @bellautos

If you have still got the old FBH ..it may be worth seeing if you can take it apart and check the build up of carbon deposits on the glow pin and flame sensor.

Be interseting to see what state they are in after all that dirty diesel going through there  Bluetooth Exchange www.bluetoothexchange.co.uk

Good idea ,Ill do it tomorrow and post some pictures

I could not resist a second start with the timer, it worked perfect this time
Lets see what tomorrow morning brings lol


Regards Pete Follow Us On Twitter @bellautos

Last edited by bellautos on Fri Jan 02 2009 10:19pm. Edited 1 time in total

Lets hope it stays working

Looking forward to the pics Bluetooth Exchange www.bluetoothexchange.co.uk