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T4R (Wireless) Thermostat & Receiver Box only
Thermostat is flashing
+
and Receiver Box LED is
flashing RED.
Wireless signal lost - Move the
Thermostat to another location to try
and restore communication.
Thermostat is flashing
+
and Receiver Box LED is off.
Check Receiver Box has power by pressing
the button to switch boiler on.
If Receiver Box has power then no wireless
binding data stored - Follow binding procedure
in the installation guide or contact your installer.
Receiver Box
LED is
flashing ORANGE.
Receiver Box is in binding mode - will
time out of this mode after 3 minutes.
T4M (OpenTherm) Thermostat only
An OpenTherm boiler can report alerts back to the Thermostat which can be useful
when contacting an installer or maintenance engineer. You can view these in the
‘OpenTherm® boiler alerts’ menu.
Description ID Error code OT Reading
Service request 001 01SR 0 = service not required
1 = service required
Low water pressure 002 02WP 0 = no WP fault
1 = WP fault
Gas/flame fault 003 03GF 0 = no GF fault
1 = GS fault
Air pressure fault 004 04AF 0 = no AP fault
1 = AP fault
Water Over Temperature 005 05WT 0 = no OVT fault
1 = OVT fault
OEM specific 006 06OS Boiler manufacturer specific code
15


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