For a Truma AquaGo that is not providing hot water, first identify its control panel and record the exact light pattern, display message or code before resetting anything. An analog dial with an exterior LED and a CP plus control panel use different indications, and a flashing or Clean indication may be part of routine decalcification rather than a fault.
Start with the control panel and the symptoms
Check whether your AquaGo has the analog indoor dial and exterior LED or a CP plus control panel. Then note exactly what the control shows, whether water flows, when the problem began, and whether you recently started decalcification or brought the RV out of storage. Truma’s troubleshooting instructions are specific to the control type; a partial flash pattern is not enough to diagnose a fault.
The AquaGo is a propane on-demand water heater. On its current Comfort product page, Truma says the burner starts when hot-water flow exceeds approximately 0.4 gallons per minute (1.5 l/min). That specification alone does not identify the cause of a no-hot-water problem: inlet flow, electrical power, propane supply, plumbing, controls and model variant can all matter. See Truma AquaGo Comfort specifications.
If the analog control is stuck in Clean mode
Turning the analog dial to Clean starts a decalcification process. According to Truma’s July 20, 2025 instructions, returning the dial to Eco or Comfort within 30 seconds may allow normal operation to continue. After that window, the cycle needs to be completed. During the documented flush, the burner does not ignite.
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- Restores full hot water performance when your AquaGo runs cooler, cycles on and off, or shows reduced flow — mineral scale inside a tankless heater's tight passages is the most common cause, and these tablets dissolve it fast.
- Genuine Truma OEM part 77300-01, formulated specifically for AquaGo Comfort and Comfort Plus tankless water heaters; not compatible with the AquaGo Basic model, so check your unit before ordering.
- Non-corrosive, quick-dissolving formula is safe for RV potable water lines and the AquaGo's internal components — no measuring, mixing, or guesswork, just drop in the pre-dosed tablets and start the cycle.
- Non-corrosive, quick-dissolving formula is safe for RV potable water lines and the AquaGo's internal components — no measuring, mixing, or guesswork, just drop in the pre-dosed tablets and start the cycle.
- Built for RV, camper, and motorhome owners on city water hookup or hard-water campgrounds; Truma recommends decalcifying every 1,585 gallons (6,000 liters) used, typically an annual task for moderate use.
- Make sure the main power and exterior toggle switch are on.
- Select Clean and wait for the pump to cycle.
- Open a hot-water faucet and let water run until the amber flashing stops. Truma says this may take 15 minutes or more; do not treat a shorter wait as completion.
- When the cycle ends, the exterior green LED goes out and red flashes indicate W31, “Decalcification Complete.”
- Turn the unit off and back on as Truma instructs, then set the indoor dial to Eco or Comfort.
Follow the complete steps for your installed control version in Truma’s AquaGo Clean-mode instructions. Truma describes W31 this way: “This is fault code 31: ‘Decalcification Complete.’” It is not, by itself, evidence of a failure.
Read AquaGo lights and codes without guessing
For an analog control, Truma says a rapid double yellow flash indicates a fault; check the red LED under the exterior rocker switch and consult the applicable owner’s manual. Truma’s guidance also identifies an appliance-temperature warning below 27°F (3°C) and W31 as decalcification completion. The guidance covers common indications, not every code, so use the manual’s complete code table for your model rather than inferring a diagnosis from an incomplete sequence.
Rank #2
- Prevents freeze-crack damage to your AquaGo tankless heater in temps as low as -4F, using an electric heating element plus circulation pump that keeps water moving through the unit overnight at a cold-weather campsite.
- Built specifically for Truma AquaGo Comfort and Comfort Plus systems; connects to the existing Easy Drain Lever and factory cable harness, so it works with the exact plumbing and wiring already in your RV or camper.
- Installs in minutes with a true plug-and-play design: insert the kit into the Easy Drain Lever, plug the connector into the AquaGo cable harness, and you are done, no cutting, soldering, or extra tools required.
- Runs on 12V DC (120W) from your house battery instead of propane, so freeze protection keeps working with the burner off, LPG cylinders closed for travel, or the AquaGo in standby between camping trips.
- Eliminates fall/spring draining and RV antifreeze flushing for winter storage or cold-climate touring, making it the practical choice for snowbirds, ski-season campers, and anyone who tows through freezing overnight lows.
For CP plus controls, read and record the displayed message or code, then follow the instructions for that control and model. Do not apply the analog panel’s light interpretation or reset sequence to CP plus. Truma’s AquaGo error-code guidance directs owners to the owner’s manual for the full list.
Decalcify the heater as routine maintenance
Truma recommends decalcifying after 1,585 gallons (6,000 liters) of water use. It says annual treatment is typical for low-to-moderate use; hard water or heavy use may call for more frequent cycles. Truma’s September 20, 2023 guidance recommends using its AquaGo Decalcification Tablets, inserted into the inlet filter. One package is sufficient for one cycle, according to Truma.
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Rank #3
- Instant Hot Water Supply - This RV tankless water heater provides an uninterrupted hot water supply with no waiting time, perfect for multiple showers. The on demand water heater is propane-powered for heating, so you won’t have to worry about electricity shortages
- High Performance Technology - With 65,000 BTU output, oxygen-free copper heat exchanger, and a brushless DC fan, this tankless rv water heater is designed for high-altitude use, preventing overheating during the summer and ensuring maximum energy efficiency, perfect for winter, heats up quickly and maintains a stable temperature
- Double Water Outlets and Compact Design - Convenient internal and external outlets for both RV living and outdoor activities. Connect directly to the external outlet for pet bathing or camping needs. The camper on-demand water heater is compact and lightweight, it can be installed in 13" x 13" opening, making installation a breeze even in tight spaces. Door size: 15" x 15"
- User-Friendly Operation - Adjustable temperature between 95°F and 123°F, with a microcomputer control panel and error codes for easy troubleshooting. It checks the incoming water temperature and adjusts the power automatically, so you get steady hot water in the all season
- Safety & Reliability - CSA certified, 24 months of service included. Offering peace of mind with built-in forced exhaust, stable combustion, freeze protection, and automatic gas shut-off for safety
Plan the work before starting: Truma recommends connecting to city water because the cleaning and rinse use substantial water. The process can take up to three hours and cannot be stopped once begun; Truma’s FAQ says the rinse uses roughly eight gallons. Use the model-specific instructions and compatible supplies. See Truma’s AquaGo decalcification instructions and Truma AquaGo accessories.
Winterize and check freeze-related concerns carefully
For winter storage, use the AquaGo procedure for your specific installation rather than generic RV plumbing advice. Truma’s October 19, 2022 instructions call for switching the heater off and letting it cool, depressurizing the system, placing it in bypass as directed by the manual, releasing the yellow Easy Drain Lever, removing the filter and storing the filter separately.
Rank #4
- 𝐇𝐢𝐠𝐡-𝐀𝐥𝐭𝐢𝐭𝐮𝐝𝐞 𝐑𝐞𝐚𝐝𝐲: 𝐅𝐥𝐚𝐰𝐥𝐞𝐬𝐬 𝐑𝐕 𝐇𝐨𝐭 𝐖𝐚𝐭𝐞𝐫 𝐇𝐞𝐚𝐭𝐞𝐫 𝐭𝐨 𝟗,𝟖𝟎𝟎 𝐅𝐭! The high altitude suitability mode allows the machine to run smoothly even when driving the caravan to the high Denver plateau at 9,800 feet. Staged combustion technology, which controls the amount of flame in summer, prevents the water from getting too hot and saves the limited propane gas available for caravan travel
- 𝐀𝐥𝐥 𝐑𝐕 𝐰𝐚𝐭𝐞𝐫 𝐡𝐞𝐚𝐭𝐞𝐫𝐬 𝐜𝐚𝐧 𝐛𝐞 𝐫𝐞𝐩𝐥𝐚𝐜𝐞𝐝: The Fogatti RV water heater have a wide range of applications. The opening is 13 x 13 inches and the door is 15 x 15 inches. It can replace Suburban and Atwood's 6 gallons tank water heaters, as well as Girard and Furrion's tankless water heaters. If you previously used a 10 gallons tank water heater, it would need to be retrofitted with an 18 x 18 inches door
- 𝐍𝐞𝐯𝐞𝐫 𝐑𝐮𝐧 𝐎𝐮𝐭: 𝐎𝐮𝐫 𝐑𝐕 𝐓𝐚𝐧𝐤𝐥𝐞𝐬𝐬 𝐖𝐚𝐭𝐞𝐫 𝐇𝐞𝐚𝐭𝐞𝐫 𝐋𝐚𝐬𝐭𝐬 𝟒𝟎+ 𝐌𝐢𝐧 (𝐯𝐬. 𝟖 𝐌𝐢𝐧 𝐓𝐚𝐧𝐤𝐬). With 55,000 BTU of power, it can produce a maximum of 2.9 GPM of hot water. Some tank heaters can only store up to 6-10 gallons of hot water and run out of hot water in 5-8 minutes, whereas our hot water supply lasts over 40 minutes
- 𝐒𝐡𝐨𝐰𝐞𝐫 𝐁𝐥𝐢𝐬𝐬 𝐟𝐨𝐫 𝐑𝐕𝐬: 𝐓𝐚𝐧𝐤𝐥𝐞𝐬𝐬, 𝐏𝐫𝐨𝐩𝐚𝐧𝐞, 𝐍𝐨 𝐂𝐨𝐥𝐝 𝐒𝐮𝐫𝐩𝐫𝐢𝐬𝐞𝐬. RV tankless water heaters are taking off. Tankless water heaters are better than tanked water heaters for continuous showering of multiple people. There is no need to waste 20-30 minutes waiting for hot water in the middle of the shower, so you can enjoy hot water at all times. It uses propane for heating, so there is no need to worry about running out of power in your caravan
- 𝐀𝐥𝐥-𝐈𝐧𝐜𝐥𝐮𝐬𝐢𝐯𝐞 𝐑𝐕 𝐖𝐚𝐭𝐞𝐫 𝐇𝐞𝐚𝐭𝐞𝐫: 𝐁𝐮𝐢𝐥𝐭-𝐢𝐧 𝐕𝐚𝐥𝐯𝐞 + 𝟏𝟓" 𝐃𝐨𝐨𝐫 + 𝟐𝐦 𝐑𝐞𝐦𝐨𝐭𝐞! Fogatti has always thought of you, with a pressure relief valve built into the product, so you don't have to buy and install it separately. And it also comes with a 15 x 15 inches door and an intelligent remote controller up to 2 meters long
- Do not use high-pressure air for the ordinary winterization procedure.
- Do not use antifreeze in the ordinary procedure; Truma says antifreeze should only be used with an installed bypass kit.
- For cold-weather travel, Truma describes an optional electric antifreeze kit; check its instructions and your installation details.
Follow Truma’s AquaGo winterization instructions and the owner’s manual for the exact appliance and bypass arrangement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to stop troubleshooting and call service
Use owner-level checks and maintenance only where Truma documents them. If a fault persists after the model-specific steps, the code is not covered by the available common-code guidance, or the issue involves technical repair, contact a qualified service provider. Truma says its Service Partners are trained to install and service AquaGo systems.
Quick Recap
Best Value
- 【Compatible Models】: This electric antifreeze kit is compatible with Truma AquaGo hot water heater, ensuring seamless operation for stability and reliability
- 【Essential for Winter】: The electric antifreeze kit protects your AquaGo from frost in temperatures as low as -4 °F (-20 °C). This kit ensures that you can reliable water heating performance even in harsh winter conditions.
- 【Easy Installation】: Easy installation through plug and play mechanism, please refer to the accompanying manual for detailed installation steps.
- 【Runs on Electricity Only 12V DC】: This kit only uses 12V DC power and does not require LPG, ensuring uninterrupted operation. Hot water is available for you at any time, without relying on gas.
- 【Save Time & Effort】：It eliminates the need for drainage, so you don't need to drain from the system in cold weather, greatly saving your time and energy.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
