How Do I Know If Surge Module Is Used Up On Watchdog HU74ZR? Is Replacement Module Available?
Published 09/23/2025
Products Featured in This Question
Question:
How do I know if my HU74ZR’s surge module is used up? Do I have to replace the whole unit?
asked by: Terry
Expert Reply:
Terry, one of the Watchdog’s # HU74ZR best features is the replaceable surge module. If it takes a hit and uses up its capacity, the bulldog face will glow red, and the app will throw an E9 error code. You’ll also see Hughes’ toll-free number pop up, or go to hughesautoformers.com to order a replacement module # HU24ZR instead of replacing the entire unit. This is a really nice benefit compared to some others on the market.
Do you like the idea of keeping a spare module on hand, or just calling when you need one? I recommend grabbing a spare module # HU24ZR if it ever needs swapped out. Keep in mind, Watchdog will actually replace the module if it happens to get used up with 2 years of purchasing the surge protector. They are very easy folks to deal with!
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Product Page this Question was Asked From
Watchdog Power Center Surge Protector and Voltage Booster - Bluetooth and WiFi - 50 Amp
- RV Surge Protectors
- Surge Protector
- Voltage Booster
- 50 Amp
- Portable
- Automatic Shutoff
- Bluetooth Monitoring
- WiFi Monitoring
- Hughes Autoformers
more information >
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