8 Reasons Joven Storage Water Heater causes Power Tripping
8 Reasons Why Your Joven Storage Water Heater is Causing Power Tripping
Introduction
Joven electric storage heaters are a premium brand from Malaysia, known for their durable stainless steel inner tanks. Many units installed in the 1990s are still in operation today, proving their longevity. However, a specific batch of Joven electric storage heaters produced in the years leading up to 2020 has been linked to frequent power tripping. This issue has become a significant talking point among handymen and Joven heater owners.
The demand for repairs surged, leading multiple service providers to advertise on platforms like Carousell under listings such as Uncle Heng, Homico.sg, Faizal, Ahmed (Handyman 24/7), @happybing, and Darceline. Searching for “Joven Heating Element” on Google also reveals many repair services.
This article explores why certain batches of Joven storage water heaters cause power tripping and how owners can address this issue.
Surge in Power Tripping Cases in 2019
In 2019, a significant increase in requests for servicing Joven storage heaters due to power tripping was reported, particularly affecting the JH series models, including:
JH25, JH35, JH38, JH50, JH56, JH68, JH91, JV25, JVA25, JVA35, and JVA50.
The common denominator among these failures was the “Made in UK Heating Element” rated at 3000W. Users reported frequent power tripping, raising concerns over the quality and reliability of these heating elements. Despite being designed for high-temperature operation, these elements failed prematurely in many cases.
8 Possible Reasons for Power Tripping
1. Corroded Heating Element Due to Lack of a Sacrificial Anode
Most storage water heaters use a sacrificial anode rod to protect the heating element from corrosion. However, Joven JH and JVA series stainless steel tanks do not include a sacrificial anode, making their heating elements more prone to corrosion.
Interestingly, Joven tanks produced in the past 30 years also lacked sacrificial anode rods, yet tripping was rare. While the absence of an anode could contribute to the issue, it is likely not the primary cause.
2. Accelerated Corrosion Leading to Small Cracks in the Heating Element
One potential cause is the shift in heating element material. In older Joven models, the heating elements may have been made from more corrosion-resistant materials such as titanium or nickel-based alloys (e.g., Inconel). However, upon inspecting a faulty Joven JH35 unit, the removed heating element appeared to be copper-based. A replacement part purchased from an authorized dealer confirmed this— Part No. 119002097, labeled “S/S H/E Copper Tin Welding C/W O Ring 3kw 240V”.
According to material studies, the immunity of heating elements to corrosion (without a sacrificial anode) ranks as follows:
- Titanium (Most Immune)
- Nickel-Based Alloys (Inconel, Incoloy)
- Ceramic-Coated Elements
- Glass-Lined Elements
- Stainless Steel
- Copper (Least Immune)
The use of copper in newer Joven heating elements may be a significant reason for premature corrosion, leading to micro-cracks that allow water ingress and electrical shorting.
3. Microfractures Due to Repeated Heating and Cooling Cycles
Storage water heaters undergo constant heating and cooling cycles. Over time, these cycles cause the heating element to expand and contract, leading to microfractures. These fractures increase the risk of water ingress, which can cause electrical shorting.
Prevention: Replace the heating element every 3 to 5 years as part of preventive maintenance.
4. Faulty Thermostat Allowing Overheating
A thermostat regulates water temperature inside a storage heater. If faulty, it may fail to switch off heating at the correct temperature, causing the element to overheat and burn out, leading to electrical faults and power tripping.
Prevention: Regularly test the thermostat. If water temperature fluctuates abnormally, replace the thermostat immediately.
5. Melted Cable Due to Undersized Wiring
Using undersized cables (e.g., 3C 70/00076 or 1.5mm² or smaller) can cause overheating, leading to melted insulation and potential short circuits.
A 3000W heating element draws approximately 13A of current, requiring a properly rated cable.
Prevention: Ensure the heater is wired with at least 2.5mm² cables marked BS6004. Avoid outdated cable standards such as BS2004 or BS6500, which are now illegal in Singapore.
6. Improper Cable Connection Without a Junction Box, Connection Unit, or Isolator
Some water heaters are installed without a proper junction box or isolator, leading to loose or unsafe wiring. Poorly connected cables can cause heat buildup, leading to electrical failures.
Prevention: Ensure electrical connections are installed according to SS638 electrical codes under the supervision of an LEW, as required by the Electricity (Electrical Installations) Regulations, Clause 7.
7. Heater Switch Failure
A failing heater switch can cause intermittent power disruptions and tripping. Over time, frequent usage can lead to burnt contacts, resulting in electrical arcing and power failure.
Prevention: Test the RCCB periodically by pressing the test button. For a more accurate test, use specialized devices like the Kyoritsu KEW 6010B to check the heater’s electrical system.
8. Faulty Residual Current Circuit Breaker (RCCB)
The Residual Current Circuit Breaker (RCCB) is a safety device that trips power when leakage current is detected. If faulty, it may trip erratically even when the heater is functioning correctly.
Prevention: Test the RCCB periodically by pressing the test button. For a more accurate test, use specialized devices like the Kyoritsu KEW 6010B to check the heater’s electrical system.
Conclusion
Power tripping in Joven storage water heaters is typically caused by corrosion, faulty components, improper wiring, or electrical overload. The recent increase in failures may be attributed to the use of copper-based heating elements, which are less resistant to corrosion compared to older materials.
Regular maintenance, proper installation, and the use of high-quality components can significantly reduce the risk of power tripping. If your Joven water heater repeatedly trips the power, consult a Licensed Electrical Worker (LEW) for diagnosis and repairs to ensure safe operation.
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