Honeywell T4 User Manual page 15

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