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1. Welcome

Thank you for purchasing this Carbon Monoxide (CO) alarm.

The symbols above mean that the alarm is suitable for use in 
domestic premises (including static caravan holiday homes), 
caravans, motor caravans and boats. 

This manual contains important safety information about the 
installation and operation of the alarm. Read the manual carefully 
and keep it in a safe place for future reference.

Honeywell offers three versions of its battery powered CO alarms, 
with different user interfaces and lifetime:

The basic model 

XC70

 uses indicator lights to visually signal the 

state of the unit and comes with 7 years life and warranty

XC100

 and 

XC100D

 both show big alarm messages in the case of 

an alarm, and both come with 10 years life and warranty. 

XC100D

 has an LCD screen to provide more information about 

rising CO levels and recorded CO peak levels.

In addition, all versions have an audible alarm and a 

TEST/HUSH

 

button.

All Honeywell X-Series alarms can be wirelessly interconnected  
using an optional plug-in module. This means that if one X-Series 
CO or Fire Alarm triggers an alarm, all interconnected units will 
give an audible alarm as well. This is especially useful, when  
living in a large or multi-story dwelling. Some wireless module 
information is included in this manual for completeness.

2. Description

3. About Carbon Monoxide (CO)

Operating and
Installation Instructions

X-Series Battery CO Alarms
XC70
XC100
XC100D

Warnings

Installation of a CO alarm should not be used as a substitute 
for proper installation, use and maintenance of fuel burning 
appliances including appropriate ventilation and exhaust 
systems.

This CO alarm is designed to protect individuals from the 
acute effects of carbon monoxide exposure. It will not fully 
safeguard individuals with specific medical conditions. If in 
doubt consult a medical practitioner.

Long exposure to low levels (>10 ppm) of CO may cause 
chronic effects. If in doubt consult a medical practitioner.

4. CO Alarm Operation continued

4. CO Alarm Operation

Normal operation

The green 

POWER

 light will flash once per minute, to indicate that 

your alarm is working. The screen of the XC100D will be blank.

Alarm

If a dangerous CO condition is detected the red 

ALARM

 light/ 

message will flash and the audible alarm will sound continuously. 

XC100D

 will display the current CO level and a skull symbol.

If the unit is in 

ALARM

 and the gas clears, the unit will go into 

Alarm Memory mode. Press the 

TEST/HUSH

 button to return to 

normal operation.

If your unit is in

 

ALARM

, keep calm, and carry out the 

following actions in the order given:

•  Open all doors and windows to increase the rate of 
   ventilation 

•  Stop using all fuel-burning appliances and turn them off  
  where possible

•  If the alarm continues, then evacuate the premises. Leave 
  the doors and windows open, and only re-enter the building 
  when the alarm has stopped

•  Get medical help for anyone suffering the effects of  
  Carbon Monoxide poisoning, such as headache or nausea,  
  and advise that Carbon Monoxide inhalation is suspected

•  Telephone the gas or other fuel supplier on their emergency 
  number, so that the source of carbon monoxide emissions 

   can be identified and corrected

•  Do not use the fuel-burning appliances again until they 
  have been checked and cleared for use by a competent 
  person according to national regulations

Note: There may be another source of carbon monoxide 
emission apart from fuel-burning appliances, for example a 
large amount of tobacco smoke, town gas or emission from a 

smouldering fire.

1

2

3

5

6

7

8

13

14

15

16

The CO alarm will activate if it has detected a certain  
concentration for a given time, as described below:

50 ppm:

 Alarm between 60 and 90 minutes

100 ppm:

 Alarm between 10 and 40 minutes

300 ppm:

 Alarm within 3 minutes

The CO alarm is set in accordance with the relevant European 
standard to provide alarms that are determined by the 
concentration and how long it has been present. This ensures 
that the alarm activates when dangerous levels of CO have built 
up over time and immediate action is required, and avoids false 
alarms from temporary low levels of CO (e.g. from cigarette 
smoke).

4

4. CO Alarm Operation continued

If the unit is in 

ALARM

, the audible alarm can be silenced for  

5 minutes by pressing the 

TEST/HUSH

 button (the red light will 

continue to flash, XC100D will show the muted symbol). If a 

dangerous gas level is still present after 5 minutes, the audible 
alarm will sound again.

Note: The 

HUSH

 function only operates if the gas reading is less 

than 350 ppm and can only be operated once

Alarm memory

CO does not leave any detectable traces, so if an alarm happens 
while you are out, the memory function will keep the red light 

flashing till the button is pressed or 7 days have passed.

XC100D

 will also show the recorded peak concentration level for 

10 seconds after pressing the button.

Event logger

Honeywell’s CO alarms record a history of events, which can 
be downloaded by professionals. This provides a more in depth 
analysis of CO events such as detailed information on the CO 
concentration of the last 7 days, and weekly maximums for the 
whole operating life. Dates of alarm events are recorded. 

Status

Lights and Sound

Display 

(XC100D)

Meaning

Alarm  

(Red)

Power 

(Green)

Fault  

(Yellow)

Ventilate

(Blue)

Sound

NORMAL  

OPERATION

Normal operation

No gas present

1 flash once every minute

ALARM

*

75%

50%

25%

PPM

Current CO concentration

Dangerous CO condition detected

Continuously 4 chirps and flashes

After 60 minutes, pattern is repeated once every 30 seconds

REMOTE CO or  

FIRE ALARM***

75%

50%

25%

PPM

Dangerous CO condition detected by 

another interconnected CO alarm

CO ALARM:

 Continuously 4 chirps

Fire ALARM:

 Continuously 3 chirps

75%

50%

25%

PPM

Fire detected by an interconnected 

fire alarm

ALARM MEMORY

PPM

Dangerous CO condition detected 

whilst user was absent.
Currently, no dangerous  

CO level present

1 chirp and flash once every minute

PRE-ALARM**

*

75%

50%

25%

PPM

Current CO concentration and 

percentage of full alarm level

A dangerous CO condition is build-

ing up.

A full CO alarm will be triggered 

later, if the CO level does  

not decrease

1 (2, or 3) chirps and flashes once every 30 seconds, increasing the longer CO is present

FAULT

*

PPM

The unit has reached its end of life 

and must be replaced

1 chirp and flash once every minute

FAULT***

*

PPM

75%

50%

25%

PPM

The wireless module is not working 

correctly. Refer to the wireless 

module manual for further details

3 chirps and flashes once every minute

www.homesafety.honeywell.com

www.honeywellanalytics.com

www.honeywell.com

UK customer service centre

Honeywell Analytics Ltd.

4 Stinsford Road

Nuffield Industrial Estate

Poole, Dorset BH17 0RZ

Tel: +44 (0)1202 645577

Fax: +44 (0)1202 665331

consumer@honeywell.com

Acts for and on behalf of Life Safety Distribution AG, 
Javastrasse 2, 8604 Hegnau, Switzerland by  
its Authorised Representative Honeywell Inc.

Please Note:

While every effort has been made to ensure 
accuracy in this publication, no responsibility  
can be accepted for errors or omissions.  
Data may change, as well as legislation, and  
you are strongly advised to obtain copies of  
the most recently issued regulations, standards, 
and guidelines. This publication is not intended 
to form the basis of a contract.

I56-4127-001
MAN0936_Issue 2_04/14_EN
© 2014 Honeywell Analytics

Separate, indicators for  
each unit state

• 

Alarm

• 

Power

• 

Fault

• 

Ventilate (pre-alarm)

 TEST/HUSH button

• 

Fault hush

• 

Alarm hush

• 

Test with reduced  

  sound level

Gas inlet

Loud sounder 
output

XC70

All alarms have four status indicator lights, an audible alarm and a 

TEST/HUSH

 button.

The green 

POWER

 light indicates that the unit is activated and 

working normally.

The red 

ALARM

 light indicates that a dangerous CO condition has 

been detected.

The blue 

VENTILATE

 light gives an early indication of a dangerous  

CO condition.

The yellow 

FAULT

 light indicates that the unit is not working 

properly. 

The 

TEST/HUSH

 button is used to test the unit, or to mute an alarm 

or fault signal.

Ventilate - Pre-Alarm

Dangerous CO levels may be caused by faulty appliances, which 
start to produce more and more CO over time. Pre-alarms will give 
an early warning of such situations even if the alarm levels are 
not being reached. If these occur frequently it is recommended 
to call a technician for further investigations. The pre-alarm will 
start giving indications once 25% of the alarm level (time and 
concentration) has been reached. For example, if 50 ppm CO is 
present, the pre-alarm will start after 15-23 minutes instead of 
60-90 minutes for a full alarm.

By default, this function is deactivated as it is not required to 
protect you from dangerous levels of CO. The installation section 
gives details of how to activate it. The pre-alarm is intended to 
help the knowledgeable end-user to get an early indication of 
malfunctioning appliances. 

If the Pre-Alarm function is activated, and CO is detected, the blue 

ventilate light will flash with a short chirp 1, 2 or 3 times every 30 

seconds when 25%, 50% or 75% of the alarm level respectively 
has been reached. 

XC100D

 will also indicate the percentage of the 

alarm level and current CO concentration. The audible alarm can 
be silenced by pressing the 

TEST/HUSH

 button (XC100D will show 

the muted symbol).

Fault – end of unit life

If the unit is in 

FAULT

 the 

YELLOW

 light will flash every minute 

with a short chirp. The CO alarm must not be used any more, 
and should be replaced. (The only exception is a wireless module 
fault, which is signalled with a triple chirp. In this case, refer to 
the wireless module manual for further details). The chirps can 
be silenced for 24 hours by pressing the 

TEST/HUSH

 

button. 

The 24 hour period can be restarted by pressing the 

TEST/HUSH

 

button twice (XC100D will show the muted symbol).

Note: The fault signal is caused by a low battery, an electronics 
failure or the end of the CO sensor life. The end-of-life signal 
comes from an inbuilt timer, and is given 10 years (XC100, 
XC100D models) or 7 years (XC70 model) after activation. 

A replace by date is also printed on the side of the unit to 
facilitate an advance replacement before the end-of-life signal 
is given. This date includes a 6 months shelf life, i.e. this is the 
latest date the unit should be replaced. An end-of-life signal may 
be given earlier.

XC100 / XC100D

Display (XC100D only)

Separate, indicators for  
each unit state

• 

Power

• 

Fault

• 

Ventilate (pre-alarm)

Gas inlet

Loud sounder 
output
Prominent action  
message:

• 

Appears only  

  in alarm  
  (“Hidden Text”)

TEST/HUSH button

• 

Fault hush

• 

Alarm hush

• 

Test with reduced  

  sound level

XC70

XC100

XC100D

Carbon Monoxide (CO) is an invisible, odourless gas which is 
highly toxic. It is produced by the incomplete burning of fuels such 

as wood, charcoal, coal, heating oil, paraffin, petrol, natural gas, 

propane, butane etc. and by cigarette smoke. A dangerous level of 

CO can occur if an appliance is faulty or badly maintained, if a flue 

is blocked or if a room is inadequately ventilated.

The poisoning effect of breathing in CO depends on the 
concentration (described in parts per million, ppm) and how long 
you are exposed for. 

Concentration

Signs and Symptoms

~ 100 ppm

Slight headache, flushing of skin 

 

(indefinite exposure)

200 – 300 ppm

Headache (5 – 6 hour exposure)

400 – 600 ppm

Severe headache, weakness, dizziness, 
nausea, vomiting (4 – 5 hour exposure)

1100 – 1500 ppm

Increased pulse and breathing rate, 
syncope (fainting), coma, intermittent 
seizures (4 – 5 hour exposure)

5000 – 10000 ppm

Weak pulse, depressed respiration / 
respiratory failure, death (1 – 2 minutes 
exposure)

Source: Health Protection Agency Compendium of Chemical Hazards,  
Carbon Monoxide, Version 3, 2011

75%

50%

25%

PPM

Alarm or Fault silenced

Replace unit

Remote fire alarm

Remote alarm triggered  
by another unit

CO concentration in PPM
Number of units in a wireless 

network (during configuration 

 

with XW100 wireless module)

Full CO alarm

CO pre-alarm levels

Contact us

Contact numbers for 

other fuel 

appliances:

Oil users:

 

Contact OFTEC on 0845 658 5080

Solid fuel users:

  Contact HETAS on 0800 600 000

*unless muted by pressing 

the TEST/HUSH button   
**only if activated during 

first time switch on  

 

***only applicable when a 

wireless interconnection  

plug-in module is installed

For liquified petroleum gas (LPG), 

Bulk and metered supplies; see telephone  

number on the bulk storage vessel or at the meter 
Cylinder supplies; see gas supplier emergency contact 

details in the local telephone directory

(The Calor Gas Emergency number is 08457 444999)

GAS EMERGENCY SERVICE  

TELEPHONE NUMBER

0800 111 999

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