E3 relates to the Salus smart plugs and smart relays you can add to an IT800WIFI system. The steps come from Salus’s iT800 installation and troubleshooting guide and its IT800WIFI technical specification.

What This Problem Means

Salus lists E3 as: “Lost link with a Salus SR600 smart relay or Salus SP600 smart plug.” Salus says you can add devices such as the SP600 or SR600 to the IT800WIFI, up to 16 in total. Both are Zigbee devices, and E3 means the system has lost its link with one of them. Salus’s fix is short: “Check power at SP/SR. Re-pair SP/SR to network.” E3 is not about the thermostat’s own link to the receiver, which is E2.

Common Symptoms

• E3 on the thermostat
• A Salus smart plug or smart relay no longer responds
• You have an SP600 or SR600 added to your IT800WIFI

Safe Checks You Can Try

1. Work out which device has dropped

E3 covers both device types: the SP600 Smart Plug and the SR600 Smart relay. If you have more than one, work through each in turn.

2. Check power at the smart plug

The SP600 is a 13 A Zigbee smart plug. Check it is pushed fully into a socket that is switched on.

3. Check power at the smart relay

The SR600 is a 16A Zigbee smart relay for 230V or volt-free switching, so it is wired in. Check the supply feeding it is switched on. Any work on its wiring needs the power turned off first and a qualified electrician.

4. Re-pair it to the network

Salus’s second fix is to re-pair the plug or relay to the network. Use the pairing steps in the Salus Premium Lite app or the device’s own Salus quick guide.

5. Watch the receiver’s ZigBee light

While you pair, Salus’s quick guide shows the receiver’s ZigBee light blinking blue when the network is open, and three green flashes when a device is found and added.

6. Check you are within the device limit

Salus says the IT800WIFI takes additional devices such as SP600 or SR600 up to 16 in total. If you have just added another one, count how many you have.

7. Rule out E2

If the thermostat also shows E2 or the app shows a grey Thermostat tile, the thermostat itself has lost its link to the receiver. Deal with that using 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.