Truma Trumatic C 6002 EH gas heater problems

Wrighpm said:
I am having the exact problem as original post. I fixed mine by firing it up with the gas isolator closed. This went through a purge/start up cycle and did not light. I then turned the boiler off, switched gas isolator back on, switched boiler to HW and heating (60) and it stayed on. ! This must have cleared something in the gas supply side I assume. This was after 2 hrs faffing and constant red lockouts.

It seems that lock-outs can occur for a variety of reasons (many stated in the post previously). In additrion to voltage/gas supply etc. also note that the blades of the small 3 " diameter fan that cools the PCB need to be kept clean as if it spins slowly it is detected and a lock-out (red light) can occur.
Also - finally - if your boiler has an electrical heating element then the physical overheat trip may have operated - this is accessed via a small peephole and can be re-set by inserting a 3 inch long probe and pressing gently.
However I would be very interested in the procedure you state above Vanity, please share. Thank you.
It would be great if Moonshadow could share the final fix too.
Click to expand...
Just got the van back this morning, too late for Goosnargh, sadly - it was the Truma Gas Regulator at fault.
 
Vanity said:
Here's how to check/oil the burner fan in a 6002.
According to the Truma tech who fixed mine, it is a common fault as the assembly is hot and the oil in the bearings dries out.
I have now done it 3 times in 5 years (lots of use!)
Symptoms - after switch on, runs for 20 secs. There's a click as the gas valve opens followed immediately by another click and the red light.

The burner assist fan is as shown.
View attachment 64966

1. Remove the cable from the fan
View attachment 64967

2. Remove 6 small torx screws around assembly. There are also two which hold the fan cover.

View attachment 64968

3. Carefully remove fan assembly. There is a sensor at the far end - be gentle.
View attachment 64969

4. With the unit out, remove the fan motor cover. You can't remove the fan blades but if you are feeling confident, remove the motor mounting screws which will allow the motor rotor to be removed and give easy access to the bearing.
A LITTLE light oil on each bearing. NOT WD40 or similar!!

5. Check fan spins nice and freely and reassemble in the reverse order.

Any questions, please ask
Click to expand...
Hello vanity, can you help me with my trumatic c 6002. I have the problem that you described it doble click and then turn red.
I tried today for the first time to run in winter mode without water in the heater, I ran for 10 min and click for trying to make hot air, and suddenly it shuts down with the red lamp. And know i can hear it turn on and open gad value and 1 click first and 1 click after.
Do you think it is because dry bearings ?
I have a video I don’t know if I can upload it here.
Regards Lasse

IMG_9039.jpeg
 
Lasseb said:
Hello vanity, can you help me with my trumatic c 6002. I have the problem that you described it doble click and then turn red.
I tried today for the first time to run in winter mode without water in the heater, I ran for 10 min and click for trying to make hot air, and suddenly it shuts down with the red lamp. And know i can hear it turn on and open gad value and 1 click first and 1 click after.
Do you think it is because dry bearings ?
I have a video I don’t know if I can upload it here.
Regards Lasse
Click to expand...
Sound like what I got with mine once and that was low volts, you turn on, it runs the fan to purge the system, then a click as the solenoid/s open the gas valve, then a click and a red light, I went to Truma in Derby twice, they ended up putting a new PCB in but that didn't work either, it's 12 years ago and I can't remember what the actual fix was but a temperature sensor rings a bell
 
Lasseb said:
Hello vanity, can you help me with my trumatic c 6002. I have the problem that you described it doble click and then turn red.
I tried today for the first time to run in winter mode without water in the heater, I ran for 10 min and click for trying to make hot air, and suddenly it shuts down with the red lamp. And know i can hear it turn on and open gad value and 1 click first and 1 click after.
Do you think it is because dry bearings ?
I have a video I don’t know if I can upload it here.
Regards Lasse
Click to expand...

Pudsey Bear said:
Sound like what I got with mine once and that was low volts, you turn on, it runs the fan to purge the system, then a click as the solenoid/s open the gas valve, then a click and a red light, I went to Truma in Derby twice, they ended up putting a new PCB in but that didn't work either, it's 12 years ago and I can't remember what the actual fix was but a temperature sensor rings a bell
Click to expand...
I have checked there is no lov voltage.
What temperature sensor did you replace ?
 
Lasseb said:
I have checked there is no lov voltage.
What temperature sensor did you replace ?
Click to expand...
Different heater so not relevant but it was inside the cover, and it was an overheat sensor so not your issue probably.
 
Solid red is a gas problem, flashing red is a low voltage problem

Truma Troubleshooting.png

Regards,
Del
 
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