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Troubleshooting - Honeywell T4M Quick Start Installation Manual

Programmable modulating thermostat
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3
Configure the System
Specific settings for the thermostat
and heating system can be
configured in the advanced menu.
Press and hold
and then
buttons together until the display
changes (approx. 3 seconds).
A) Press
and
buttons to navigate
through the parameter list
C) Press
button to save the change
(or press
to cancel the change)
OpenTherm Data ID's
N
Description
o
OT1
Low load control
OT2
Control setpoint
Supply water temperature
OT3
OT4
Return water temperature
OT5
Max. supply water temperature
Hot water temperature
OT6
OT7
Hot water setpoint
OT8
Actual power
Water pressure
OT9
OT10
OTC control
OT11
OTC curve
Room compensation
OT12
Conforms to protection requirements of the following directives:
EMC: 2014/30/EU and LVD: 2014/35/EU
ErP: Class VI (+4%), (EU) 811/2013
WEEE Directive 2012/19/EC - Waste Electrical and Electronic Equipment directive
At the end of the product life dispose of the packaging and product in a corresponding recycling
centre. Do not dispose of the unit with the usual domestic refuse. Do not burn the product.
Parameter
Number
Parameter
Setting
B) Press
and
buttons to
change a parameter
D) Press
button to exit advanced
menu and save any changes
Settings (default in bold)
0 = Off, 1 = On
5 - 99°C
5 - 99°C
5 - 99°C
5 - 99°C
5 - 99°C
5 - 99°C
0 - 99%
0.0 - 9.9
0 = Off, 1 = On
4 - 40 (16)
0 = Off, 1 = On
Parameters
N
o
Description
1:LA
Language
4:LL
Lower Temperature Limit
5:UL
Upper Temperature Limit
6:SO
Schedule options
7:NP
Number of periods per day
8:SS
Wired Remote Sensor
Fail Safe mode
9:LC
10:BL
Backlight
11:CL
Clock Format
Daylight Saving time change
12:DS
13:TO
Temperature Display Offset
15:SD
Restore Schedule Defaults
Restore Factory Settings
16:FS

Troubleshooting

What's happening?
What it could mean...
Thermostat
No power to
display is blank
heating system
Faulty wiring connection
Faulty temperature
Display =
sensor
Thermostat shows
Boiler (water) already
heat demand
at temperature
but boiler doesn't
Faulty wiring connection
respond
Honeywell Control Systems Ltd.
Manufactured for and on behalf of the Environmental & Energy Solutions
Skimped Hill Lane,
Division of Honeywell Technologies Sàrl, ACS-E&ES, Z.A., La Pièce 16,
Bracknell,
1180 Rolle, Switzerland by its Authorised Representative Honeywell Inc.
Berkshire
RG12 1EB
www.honeywelluk.com
© 2016 Honeywell International Inc. | Printed in UK
Settings (default in bold)
1 = EN, 2 = NL, 3 = DE, 4 = FR, 5 = ES
5 - 21 (°C)
21 - 35 (°C)
1 = 7 day (different schedule each day of the week)
2 = 5 + 2 day (weekday + weekend schedule)
3 = 1 day (same schedule every day)
4 or 6
0 = No Remote Sensor, 1 = Wired Remote Sensor
0 = Boiler off, 1 = Boiler 20% on / 80% off
0 = Off, 1 = On (only on demand)
0 = 24 hr, 1 = AM/PM
0 = Off, 1 = Auto
+/-1.5°C
0, 1 = reset
0, 1 = reset
How to fix it...
Check heating system is powered
Check wiring at thermostat
and boiler terminals
Replace thermostat or check wiring to
remote temperature sensor if fitted
Normal behaviour - wait for
water temperature to drop
Check wiring at thermostat
and boiler terminals

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