The IT800TX thermostat has a built-in rechargeable battery, and Salus says it can drain while the unit is in storage. These steps come from Salus’s iT800 FAQs and spec sheet.

What This Problem Means

Salus’s FAQ says that if the thermostat will not turn on, hold the button for 5 to 7 seconds, and if it is still off, charge it on the stand; a red battery symbol confirms charging has started. Salus notes the unit can drain in storage, and its quick guide says the thermostat ships partially charged, so a new thermostat may need charging before it does anything. The battery is a 750mAh rechargeable lithium-ion cell, charged on the dock.

Common Symptoms

• The thermostat screen stays blank
• Nothing happens when you press the button
• The charge indicator is stuck at half on the dock
• The thermostat shows E5 (low battery)

Safe Checks You Can Try

1. Hold the button

Hold the thermostat’s button for 5 to 7 seconds, as Salus’s FAQ says.

2. Charge it on the stand

If it stays off, sit it on the charging stand, with the dock connected by its USB Type-C cable. Salus says a red battery symbol confirms charging has started.

3. Make sure it sits flush

Salus says charging only works when the padded back sits flush on the dock. If the charge indicator is stuck at half, remove anything between the thermostat and the dock.

4. Give it a full charge

Salus’s spec sheet gives a charge time of up to 24 hours, or up to 48 hours with the always-on display. For E5, Salus says to recharge on the dock for 24 hours.

5. Check the always-on display setting

Salus’s FAQ says you can enable “Display Always on” in the app while the thermostat is docked. Salus gives a longer charge time with this feature on.

6. If you see 88.8

Salus says 88.8 on the screen means either a unit reset or identify mode. A short press of the receiver’s ZigBee pinhole toggles identify mode.

7. Check the link once it is on

Once the thermostat is running, check the app. A grey Thermostat tile or E2 means it needs to reconnect to the receiver: see our lost connection guide.

When To Contact Support

If you have worked through these steps and the problem is still there, contact Salus through its UK technical support portal or its UK contact page, or speak to the installer who fitted your receiver. Have any error code on the thermostat, and what the receiver’s lights are doing, to hand.