Question 1

The water's taking a really long time to heat up

Accepted Answer

Possible cause: Water container furred. Descale the water system in accordance with the maintenance instructions.

Question 2

Water's running straight back out - the water container won't fill

Accepted Answer

Possible cause: Safety / drain valve open. Close the safety / drain valve.

Question 3

The water container won't drain, even with the safety/drain valve open

Accepted Answer

Possible cause: Either the safety/drain valve's drainage socket is blocked, or a water pipe has frozen. Check opening for dirt such as slush, ice, or leaves and remove if necessary, or thaw the water pipe.

Question 4

Water's dripping or flowing from the safety/drain valve's drainage socket

Accepted Answer

Possible cause: Water pressure too high. Check the pump pressure stays under 2.8 bar, and fit a pressure reducer if it's connected to mains water.

Question 5

The FrostControl opens after the heater's been switched off

Accepted Answer

Possible cause: Below roughly 3°C, the FrostControl opens on its own. Switch the heater on - with it off, the FrostControl won't close again until the temperature climbs to around 7°C or above, unless a FrostControl heating element is fitted.

Question 6

The FrostControl won't close any more

Accepted Answer

Possible cause: Either the FrostControl's own temperature has dropped below roughly 7°C, the rotary switch isn't set to Operation, or the FrostControl itself is faulty. Switch the heater on to bring the temperature above 7°C, turn the rotary switch to Operation, and press the pushbutton in until it clicks. If it's actually faulty, have an authorised service agent replace the valve.

Question 7

After the appliance starts, thick smoke keeps coming out of the wall cowl for over a minute

Accepted Answer

Possible cause: Could be a fuel supply fault, incorrect installation, or a restricted combustion air inlet. Stop using the appliance immediately due to fire hazard and contact customer service or an authorized service agent.

Truma Combi D E Next Generation

Technical Specifications

Master Troubleshooting & Diagnostics Matrix

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`N/A`	The water's taking a really long time to heat up	Water container furred	Descale the water system in accordance with the maintenance instructions.	DIY Safe
`N/A`	Water's running straight back out - the water container won't fill	Safety / drain valve open	Close the safety / drain valve.	DIY Safe
`N/A`	The water container won't drain, even with the safety/drain valve open	Either the safety/drain valve's drainage socket is blocked, or a water pipe has frozen	Check opening for dirt such as slush, ice, or leaves and remove if necessary, or thaw the water pipe.	DIY Safe
`N/A`	Water's dripping or flowing from the safety/drain valve's drainage socket	Water pressure too high	Check the pump pressure stays under 2.8 bar, and fit a pressure reducer if it's connected to mains water.	DIY Safe
`N/A`	The FrostControl opens after the heater's been switched off	Below roughly 3°C, the FrostControl opens on its own	Switch the heater on - with it off, the FrostControl won't close again until the temperature climbs to around 7°C or above, unless a FrostControl heating element is fitted.	DIY Safe
`N/A`	The FrostControl won't close any more	Either the FrostControl's own temperature has dropped below roughly 7°C, the rotary switch isn't set to Operation, or the FrostControl itself is faulty	Switch the heater on to bring the temperature above 7°C, turn the rotary switch to Operation, and press the pushbutton in until it clicks. If it's actually faulty, have an authorised service agent replace the valve.	DIY Check / Tech Fallback
`N/A`	After the appliance starts, thick smoke keeps coming out of the wall cowl for over a minute	Could be a fuel supply fault, incorrect installation, or a restricted combustion air inlet	Stop using the appliance immediately due to fire hazard and contact customer service or an authorized service agent.	Professional Intervention Required