Atlantic
DHW Control Misconfiguration
Thermostat fails to control domestic hot water (DHW) as scheduled.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
DHW relay not wired, DHW function disabled in installer menu, Incorrect schedule for DHW, Cylinder thermostat overriding Atlantic control
How to Fix / Troubleshooting
Safety first: Isolate power to the boiler and control circuits before working on DHW wiring.
- Step 1 – Verify DHW feature: Confirm your Atlantic thermostat model supports DHW control and that the feature is enabled in the installer menu.
- Step 2 – Check wiring: Ensure the DHW output terminals on the thermostat or receiver are wired to the correct DHW valve or boiler input.
- Step 3 – Review DHW schedule: In the app or thermostat, verify that DHW time periods are correctly programmed and not set to Off.
- Step 4 – Cylinder stat: Make sure the cylinder thermostat is set to the desired temperature and not permanently satisfied, which would prevent DHW calls.
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Repair Difficulty
Medium
3/5
Required Part
DHW Output Relay / Wiring to Cylinder or Boiler
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