Manual Honeywell CM727 (page 11 of 12) (English)

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Installation Guide 11

6) Trouble Shooting

6.1 Trouble Shooting Guide

Symptom (Fault

Message)

Possible Cause Remedy

The room thermostat

displays the

symbol but

the relay box relay does not

switch on.

This is normal operation. The relay box cycles

the relay on and off for times proportional to

the demand signal (0-100%) from the room

thermostat. The

symbol only indicates that the

demand value is greater than 0%.

Using the

button change the

temperature setpoint by a few degrees.

The relay box should switch the relay on

after a few seconds delay.

The relay box does not

react to setpoint changes

on the room thermostat.

The room thermostat and relay box are not

bound.

Reset the relay box by pressing and

holding the push button for 15 seconds.

Then follow the binding / rebinding

procedure as described in section 5)

Additional Installation Information.

After the binding procedure

the red LED is on and the

green one is ﬂashing once

every 3 sec on the relay

box.

Incorrect or incomplete binding procedure.

Incorrect position of the room thermostat during

binding.

Repeat the binding procedure.

Repeat the binding procedure keeping

approx. 1 m distance between the relay

box and the room thermostat.

The red LED on the

relay box is illuminated

(Communication loss)

The relay box receives no RF messages from the

room thermostat:

RF signal is blocked due to wrong location of the

room thermostat.

Room thermostat batteries are exhausted.

Re-locate the room thermostat following

instructions in section 2) Installing the

CM700 Wireless System.

Replace batteries in the room thermostat.

6.2 Diagnostic Mode

The CM727/721 room thermostat has a user accessible mode that provides information useful to a remote

service person and a means of checking whether the boiler is working. To access this press the OFF

button, then press and hold the button for 5 seconds. The room thermostat will enter the user settings

mode. Next press and hold the and buttons together. The room thermostat will hold the relay on for

5 minutes and the following information can be viewed on the display by pressing the or button. :

model ID, date code (WW/YY) & checksum.

1

My heating is not coming on when I set it to the manual button Submitted on 26-5-2023 at 15:50
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- It may be because the room temperature is already at temp. Try turning the temp up and see if it fires. Answered on 27-5-2023 at 08:53
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When I set my thermostat to manual the heating doesn’t come on, where am I going wrong. Thank you Submitted on 26-5-2023 at 15:49
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We’re going away for 4 weeks soon , I’ve set the Thermos on Auto to come on twice a day for an hour to prevent any freezing in the pipes- will the thermos still come on automatically between the set times if the temp drops below a certain level? In other words, will our heating be on full time when we’re away during a cold snap? Obviously this is going to incur high charges for us .Any advice appreciated Submitted on 12-12-2022 at 06:43
Reply Report abuse
Hi I have a CM721 and CM727 Honeywell Thermostat.
I cannot manage to keep the temperature to remain constant, IE At night I sometimes need 23 C to stay warm during the night ( otherwise I get cramp! )
Which button/s do I press and in which sequence please ?
Many Thanks,

Alan
Submitted on 15-11-2021 at 12:31
Reply Report abuse
- You’d have to leave the thermostat on manual and adjust the temperature with the up and down arrow buttons to the right hand side of the screen Answered on 15-11-2021 at 12:33
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Why does the heating come on outside of the times I have set it to come on, when in auto mode? Submitted on 3-11-2021 at 08:16
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