Truma Combi Service Handbook
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Also See for Combi:
- Operating instructions manual (298 pages) ,
- Frequently asked questions manual (16 pages) ,
- Operating instructions manual (12 pages)
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Table of Contents
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Summary of Contents for Truma Combi
- Page 1 Truma Combi Service Handbook...
- Page 2 *** Please include the model and serial number of the Truma system in question with all inquiries. If the Truma Service Representative is unable to support in finding a resolution to the issue, they will provide you a Warranty Claim Number if the unit is within the Warranty Claim period and the following steps must be followed: •...
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Page 3: Description & Technical Data
Description & Technical Data With more than 20 years of reliable service in Europe and Australia, Truma Combi furnaces are the most energy-efficient and lightest heating systems on the market. Truma Combi heaters combine two functions in one appliance. They warm the living area and heat water in the integrated stainless steel tank. -
Page 4: Component Glossary
Powered by a separate 12VDC source from the Combi and protected with a 1A in-line fuse. Connected to the Truma Combi PCB by a data cable. A W 255 H error code will be displayed on the CP Plus in the event of a connectivity issue with the Combi PCB. - Page 5 NEMA 5-20P outlet plug. 13. Warm Air Outlets : Duct work (65mm) connections to the Combi. (4) Warm Air Outlets altogether, though Combi Eco models may only utilize (3), with one of the bottom outlets blocked off with a blank cover (34310-02).
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Page 6: Additional Components
17. Room Air Temperature Sensor : NTC thermistor that tells the Combi the ambient temperature within the living space by converting temperature to resistance Ω. Connected to the Combi PCB by a wiring harness. At 77⁰F (25⁰C), the Room Air Temperature Sensor should register approximately 10K Ω. X10 and X11 wire harness connection points at Combi PCB from RTS are not polarity sensitive. -
Page 7: Sequence Of Operations
Step 1. Once the Combi receives a call for heat from the CP Plus, a Green LED will illuminate on the PCB. The Combustion Air Motor and the Circulation Air Fan* will run for 30 seconds to purge the system. The Combustion Air Motor and Circulation Air Fan* will ramp up to operating level 2 (14,300BTU) fan speeds right before the start of Step 2. - Page 8 CP Plus - Functions CP Plus – Tips & Tricks...
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Page 9: Common Error Codes
Air circulation motor or PCB Go to Blue Pages: fault Check Air Circulation Motor, then PCB ssls, llsl No 120VAC supply to Combi Fault in 120VAC power supply, Verify 120VAC supply WECO manual reset switch voltage/engaged GFCI, engaged reset WECO manual... - Page 10 Flame was not detected during Same steps as #112 ignition sequence – potential combustion issue (air, fuel, spark) CP Plus – Combi communication and/or Combi 12VDC supply power Verify 12VDC supply 12VDC failure inadequate or non-existent or voltage between 11-...
- Page 11 The Blue Pages: 12VDC Continuity Component Measuring points Function/Setpoint Remark Continuity (0 Ω) Input fuse F1 Switch off the appliance, remove the Replace fuses only with similar fuse and check for continuity fuses. Continuity (0 Ω) Air temperature switch Pull out the X19 plug The switch must be closed Continuity between Opens at 374°F/190°C...
- Page 12 The Blue Pages: 12VDC Voltage: Applied Component Measuring points Function/Setpoint Remark Pull out X7 plug Ignitor (step 1) Ignition spark can be If you cannot hear the ignitor ticking, Apply 12 V between X7-11 (+) and heard and seen replace the ignitor X7-10 or 9 (-) Combustion air motor Pull out X7 plug...
- Page 13 12VDC PCB X4 F1 X10/X11 X8/X9 • F1: Input fuse 10 AT • 12V: Contact pins, supply cable • X3: D.C. motor connector • X4: FrostControl connector (Euro only) • X5: Control panel connector • X6: Diagnostics device connector • X7: Cable harness connector, 12VDC •...
- Page 14 The Blue Pages: 120VAC Continuity Component Measuring points Function/Setpoint Remark Continuity (0 Ω) Input fuse F4 Continuity test on If no continuity, removed fuse replace fuse Voltage: Measured Component Measuring points Function/Setpoint Remark 120 V supply cable L3 Voltage measurement between 120 V voltage If no voltage is measured, N and L...
- Page 15 More times than not, the cause of the W 45 H code is a loss of 120VAC supply power to the Combi. This could be the result of a failed 20A fuse at the breaker panel or the fact that the NEMA 5-20P plug from the Combi simply is not plugged into the outlet.
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Page 16: Access Instructions
If access to components such as the Circulation Air Fan must be achieved after proper troubleshooting: Step 1: Remove (4) labeled T20 Torx screws and remove Combi End Cover. A) – Access to the Combustion Air Fan can be achieved by lifting off cover plate labeled “A”. - Page 17 Winterization The Combi furnace does not feature a frost protection function. The water container must be drained if the RV will not be used whenever there is a risk of frost as severe damage to the plumbing components and the Combi could occur due to freezing.
- Page 18 Purpose: The purpose of this procedure is ensure that the Truma Combi, after being installed in accordance with the applicable manuals and standards, is functionally tested prior to delivery. This test procedure is not meant to test all functions of the system, and does not absolve the manufacturer or service technician from their responsibilities relative to the manuals delivered by Truma Gerätetechnik GmbH &...
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Page 19: Spare Parts And Accessories
Spare Parts & Accessories... - Page 20 Part number Description Information 34020-00059 Cover incl. grill 34020-06500 Truma Combi connection cover 34020-00058 PCB Truma Combi comfort/comfort plus 34020-00057 PCB Truma Combi eco/eco plus 34020-00060 Power PCB, 120V with cable 34020-00078 Combustion Air Motor with round cord seal, screws Fan Wheel –...
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Questions and answers
Have a Truma combi D4E Error code E545H Can’t find what it is and what to do about it, anywhere.
Error code E525H on the Truma Combi D4E indicates a failure of the boiler to ignite, resulting in no heat or hot water. This can occur regardless of whether the power source is gas, electric, or mixed.
A known cause is that the gas supply to the boiler is blocked, often due to the boiler's gas manifold tap being in the closed position, even if it appears open. To resolve the issue:
1. Check the gas bottle, regulator, and connections to confirm gas supply is available.
2. Inspect the gas manifold taps, especially the one for the boiler.
3. Ensure the tap icon is correctly aligned—if it is upside down, the gas may still be off even if it looks open.
4. Rotate the gas tap 180 degrees to fully open it.
After correcting the gas supply, the boiler should ignite and the error should clear.
This answer is automatically generated
Truma Combi 4E error code showing E6H - unable to determine what this indicates.
The E6H error code on the Truma Combi 4E indicates a problem related to combustion air infeed or exhaust. This may involve a blockage or failure in the air intake or exhaust system, the motor, or the control board.
This answer is automatically generated
I have a combi 6e heater/water heater.the other functions work fine but my water heater has air in it and therefore does not heat correctly. The water heater words as it should do on electric. I have tried turning on the taps many times until the flow is correct but when I switch them off and on again in a few minutes the spluttering starts again.
Occasionally getting E119H code on furnace and don’t see that code in the manual. I press the button on the control panel and seems to clear and start working again. Usually happens once a night.
I had to replace the control panel on my truma combi in my 2020 Winnebago Boldt KL. Now I can not get the screen to the main menu to run the unit. It simply stays in the maintenance screen no matter what I do.
I have an error code of E181H, I can't find out what it is