Question 1

The boiler won't run once switched on (gas mode)

Accepted Answer

Possible cause: No 12V power supply. Check the battery voltage is at least 10.5V, and check the electronic control unit's fine-wire fuse. Contact an authorised service agent if this doesn't resolve it.

Question 2

The boiler won't run once switched on (gas mode)

Accepted Answer

Possible cause: Window open above cowl. Close the window above the cowl.

Question 3

The boiler switches on but doesn't run, and the red LED comes on after roughly 30 seconds

Accepted Answer

Possible cause: Cowl cover is fitted. Take the cowl cover off and clear away any dirt or debris found there.

Question 4

The boiler switches on but doesn't run, and the red LED comes on after roughly 30 seconds

Accepted Answer

Possible cause: No gas supply or incorrect gas pressure. Check gas valves and gas cylinder.

Question 5

The boiler switches on but doesn't run, and the red LED comes on after roughly 30 seconds

Accepted Answer

Possible cause: Air in gas supply. Switch the appliance off, leave it for 5 minutes to bleed off any trapped air, then switch it back on to clear the fault.

Question 6

After a long spell of running, the boiler faults out and the red LED comes on

Accepted Answer

Possible cause: Overtemperature sensor has activated. Close the drain valve and top up the water content if it's low. Switch the appliance off for 5 minutes and back on to clear the fault; if it recurs, contact an authorised service agent.

Question 7

The boiler won't run once switched on (BGE 10 electrical mode)

Accepted Answer

Possible cause: No 230V power supply. Hook the vehicle up to a mains supply and/or check the residual current protective device.

Question 8

The boiler won't run once switched on (BGE 10 electrical mode)

Accepted Answer

Possible cause: Overtemperature sensor has activated. Close the drain valve and top up the water content if it's low. The electric heating element has its own overtemperature sensor - turn it off at the control panel, wait 10 minutes and turn it on again. Contact an authorised service agent if the problem persists.

Question 9

Heats up too slowly with the switch set to 850W (BGE 10 electrical mode)

Accepted Answer

Possible cause: Insufficient heating output selected for conditions. Contact Truma Service or an authorized workshop.

Question 10

Water dripping from drain valve

Accepted Answer

Possible cause: Water pressure too high. Check the water pressure doesn't exceed 2.8 bar - fit a pressure reducer if connecting to a mains water supply.

Question 11

Warm water comes out of the cold tap

Accepted Answer

Possible cause: Hot water is flowing back into the cold supply.. Fit a non-return valve into the cold water supply, following the installation instructions.

Truma BG 10 BGE 10

Technical Specifications

Master Troubleshooting & Diagnostics Matrix

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`N/A`	The boiler won't run once switched on (gas mode)	No 12V power supply	Check the battery voltage is at least 10.5V, and check the electronic control unit's fine-wire fuse. Contact an authorised service agent if this doesn't resolve it.	DIY Check / Tech Fallback
`N/A`	The boiler won't run once switched on (gas mode)	Window open above cowl	Close the window above the cowl.	DIY Safe
`N/A`	The boiler switches on but doesn't run, and the red LED comes on after roughly 30 seconds	Cowl cover is fitted	Take the cowl cover off and clear away any dirt or debris found there.	DIY Safe
`N/A`	The boiler switches on but doesn't run, and the red LED comes on after roughly 30 seconds	No gas supply or incorrect gas pressure	Check gas valves and gas cylinder.	DIY Safe
`N/A`	The boiler switches on but doesn't run, and the red LED comes on after roughly 30 seconds	Air in gas supply	Switch the appliance off, leave it for 5 minutes to bleed off any trapped air, then switch it back on to clear the fault.	DIY Safe
`N/A`	After a long spell of running, the boiler faults out and the red LED comes on	Overtemperature sensor has activated	Close the drain valve and top up the water content if it's low. Switch the appliance off for 5 minutes and back on to clear the fault; if it recurs, contact an authorised service agent.	DIY Check / Tech Fallback
`N/A`	The boiler won't run once switched on (BGE 10 electrical mode)	No 230V power supply	Hook the vehicle up to a mains supply and/or check the residual current protective device.	DIY Safe
`N/A`	The boiler won't run once switched on (BGE 10 electrical mode)	Overtemperature sensor has activated	Close the drain valve and top up the water content if it's low. The electric heating element has its own overtemperature sensor - turn it off at the control panel, wait 10 minutes and turn it on again. Contact an authorised service agent if the problem persists.	DIY Check / Tech Fallback
`N/A`	Heats up too slowly with the switch set to 850W (BGE 10 electrical mode)	Insufficient heating output selected for conditions	Contact Truma Service or an authorized workshop.	Professional Intervention Required
`N/A`	Water dripping from drain valve	Water pressure too high	Check the water pressure doesn't exceed 2.8 bar - fit a pressure reducer if connecting to a mains water supply.	DIY Safe
`N/A`	Warm water comes out of the cold tap	Hot water is flowing back into the cold supply.	Fit a non-return valve into the cold water supply, following the installation instructions.	DIY Safe