The WZ600 receiver in the IT800WIFI kit has two lights: one for the internet connection, and one for heat demand and the ZigBee network. This guide follows the light list in Salus’s IT800WIFI quick guide, which shows them in a diagram, so compare what you see with that diagram as well.

What This Problem Means

The receiver is wired to your boiler and has the gateway built in. Its internet light tells you about the Wi-Fi and internet link that the Salus Premium Lite app uses. Its demand light shows whether the thermostat is calling for heating or cooling, and also shows ZigBee pairing. Salus’s set-up article confirms the pairing pattern: the ON/OFF button light flashes blue while the receiver is ready to pair, and goes green when pairing closes. Salus’s IT700 quick guide shows the same states for the same receiver.

Common Symptoms

• The internet light is blinking red
• The demand light is blinking blue and will not stop
• The receiver shows no lights at all
• A light pattern you have not seen before

Safe Checks You Can Try

1. Internet light: solid blue

Solid blue means the receiver is connected to the internet. If the app still shows a grey Receiver tile, see our offline guide.

2. Internet light: blinking red

Blinking red means the internet connection has been lost. Salus’s checks are power to the receiver, your router, the router’s firewall, and a Wi-Fi booster between the router and the receiver if the signal is weak. Salus’s FAQ reboot (mains off for about 10 seconds; settings are kept) is also worth a try.

3. Internet light: any other pattern

If the internet light shows anything other than solid blue or blinking red, check it against the light diagram in Salus’s quick guide. If the receiver has not been set up on your Wi-Fi yet, set it up: turn on Bluetooth on your phone, press the right-hand (RHS) pinhole for 3 seconds and add the gateway in the Salus Premium Lite app.

4. Demand light: solid red, blue or green

Solid red means heat demand, solid blue means cooling demand, and solid green means no heat or cooling demand, or no devices linked. If the room is cold and you see solid green, check the thermostat’s mode and set temperature with our no heating guide.

5. Demand light: blinking blue

Blinking blue means the ZigBee network is open for pairing. In Salus’s re-pair, a 3-second press of the ZigBee (left-hand) pinhole opens it, and another 3-second press closes it, when the light turns green.

6. Demand light: green flashes

Three green flashes mean a device has been found and added. Blinking green means identifying mode, or an over-the-air update in progress. Salus’s FAQ says a short press of the receiver’s ZigBee pinhole toggles identify mode.

7. Demand light: blinking red

Blinking red means the receiver is deleting all its paired devices, as it does in a factory reset (ZigBee and WiFi buttons held together for 10 seconds). Afterwards the thermostat needs re-pairing: see our reset and re-pair guide.

8. No lights at all

Start with the receiver’s power. Salus says no power at the receiver gives grey app tiles plus E2 on the thermostat. The WZ600 receiver runs from 230V AC and is wired to your boiler, so check the supply feeding it is switched on. Do not open the receiver: any work on its wiring needs the power turned off first and a qualified electrician or heating engineer.

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.