Advertisement
TROUBLESHOOTING – T4 and T4M only
Problem Display
Thermostat display is blank
Display shows
(only for T4)
Display shows
Thermostat shoes heat
demand
but boiler doesn't
respond
TROUBLESHOOTING – T4R
Problem Display
Thermostat display is blank
Display shows
Display shows
Thermostat shoes heat
demand
but boiler doesn't
respond
Thermostat displays shows
and Receiver Box
LED is flashing RED
Thermostat displays shows
and Receiver Box
LED is flashing OFF
Receiver Box
LED is flashing
ORANGE
ORDERING SPECIFICATION
Description
T4 wired thermostat
T4 wired thermostat for
OpenTherm boilers
T4 wireless thermostat
Possible Cause
Batteries exhausted, installed
incorrectly or tab hasn't been
removed
Battery power critically low
Faulty temperature sensor
a. Boiler water already at
temperature
b. Faulty wiring connection
Possible Cause
Batteries exhausted, installed
incorrectly or tab hasn't been
removed
Battery power critically low
Faulty temperature sensor
a. Boiler water already at
temperature
b. Faulty wiring connection
Wireless communication with
Receiver Box is lost
Thermostat and Receiver Box
not bound
Receiver Box is in bind mode
Model
T4H110A1021
T4H310A3032
Y4H910RF4003
T4 PROGRAMMABLE THERMOSTAT
Remedy
Unclip thermostat from wall and check
battery installation - replace batteries if
necessary
Unclip thermostat from wall and replace
batteries immediately
Replace thermostat or check wiring to
remote temperature sensor if fitted
a. Normal behaviour – wait for water
temperature to drop
b. Check wiring at thermostat and boiler
terminals
Remedy
Pull thermostat from wall bracket or
table stand and check battery installation
- replace batteries if necessary
Pull thermostat from wall bracket or
table stand and check battery installation
- replace batteries if necessary
Replace thermostat or check wiring to
remote temperature sensor if fitted
a. Normal behaviour – wait for water
temperature to drop
b. Check wiring at thermostat and boiler
terminals
Move thermostat to a location where
wireless communication is reliable
Move thermostat to a location where
wireless communication is reliable
Wait for bind mode to time out (3min) or
bind a Thermostat
EAN code
5025121381215
5025121381208
5025121381079
Literature
All packaging contains 6
languages: English,
Dutch, French, German,
Italian and Spanish
Advertisement
