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Sentinel HD55S E1 (temperature/humidity sensor issue)

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I have a Sentinel HD55S which is showing the E1 error that others on here have mentioned and seems to be a common issue as caused by the humidity sensor.  Attached picture shows the sensor from my unit with the obvious corrosion, which seems to me to be a reasonable guess as to the cause of the issue.

I am looking in to getting a replacement sensor board sent to me so I can swap it out.  My questions are:

1: The circled component on the board is the actual surface mount humidity and temperature sensor module.  Does anyone know if I were to coat the board (with the exception of the single circled component that obviously needs to be exposed to the air) with a silicone based conformal PCB coating if that would extend the life of the module or would it cause other issues?
    1a: Alternatively, an ePTFE cover over the vent opening for the sensor?
2: What would be the effects of relocating the module to a different part of the dehumidifer that wasn't directly underneath the evaporation coils and might be more protected against water contact?
 

Asked on Jun 23, 2026 - 05:09:50pm
John Bourke
Answers

Alorair Team

Answered on Jun 29, 2026 - 12:15:50am

Dear John,

Thank you for sharing your detailed feedback regarding the E1 error and sensor board issue. We truly appreciate your time and suggestions.

We understand your concern about the sensor module corrosion and its potential impact on your HD55S. Please contact our support team at [email protected] with your order number, information and issue details, and our after-sales team will assist you with the next steps.

We have also shared your feedback with our technical team, and they are working on improving the sensor protection design to enhance long-term reliability.

Thank you again for helping us improve our products and customer experience.

Best regards,
AlorAir Team

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