Hot Water Cylinder Thermostat Problems

Having trouble with your hot water cylinder thermostat can be a frustrating experience, especially when multiple professionals have already taken a look. In this guide, we’ll explore some common issues and potential solutions to help you get your hot water heating back on track.

Understanding the Setup

Before diving into troubleshooting, let’s briefly review your heating system’s setup:

  • You have a gas system boiler (Vaillant ecoTEC plus 624 R1) with a new pump and PCB installed recently.
  • An UNICYL HE indirect unvented 150L Cylinder is used for hot water storage.
  • The cylinder thermostat in question is the ESI ESCTDEB Electronic dual cylinder thermostat.
  • A Nest Thermostat, the “learning” type, controls both heating and hot water.
  • Traditional radiators are part of the system.

Issue: Cylinder Thermostat Not Working

The problem you’ve encountered is that your cylinder thermostat is not functioning correctly. It used to turn on when you boosted hot water using the Nest thermostat, but it no longer does.

Potential Solutions:

  1. Check the Wiring: Inspect the wiring connections at both the cylinder thermostat and the wiring box. Ensure they are secure and correctly connected. In particular, make sure the neutral supply (usually grey or blue) to the thermostat is correctly connected at both ends.
  2. Cable Replacement: If the wiring appears damaged or incorrectly configured, consider replacing it with a suitable 5-core flex cable. This will ensure you have the necessary connections for your cylinder thermostat.
  3. Address Wiring Errors: If you discover any wiring errors, correct them by reconfiguring the connections according to standard wiring practices. For instance, the green/yellow wire should be reserved for earth connections only.
  4. Cylinder Stat Configuration: Ensure that the cylinder thermostat is set up correctly according to the manufacturer’s instructions. Double-check the user manual or guidelines to ensure it’s configured to provide a permanent power supply.
  5. Professional Help: If the issue persists or you’re uncertain about making wiring changes yourself, consider seeking the assistance of a qualified electrician or heating system specialist. They can diagnose and resolve any complex wiring issues and ensure your system operates as intended.

Conclusion

Troubleshooting hot water cylinder thermostat problems can be challenging, but a systematic approach to checking the wiring and addressing any configuration issues can help you identify and resolve the root cause. Remember to prioritize safety and seek professional help if needed to ensure your hot water heating system functions efficiently.

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