Honeywell CM737 User Manual

CM737
User instruction
15
4 Troubleshooting the CM737
Symptom
Possible Cause
Remedy
A flashing symbol
appears on the display within
one minute of the CM737 being
powered on.
The CM737 receives power
supply from the heating
appliance, but no information.
The CM737 is not connected to
the correct terminals of the
heating appliance.
Check if the wiring is connected
to the Open Therm connection
terminals of the heating
appliance.
The heating appliance is not
configured correctly.
Contact Alfa Laval.
A symbol appears
permanently (no flashing) on
the display.
Communication error due to an
interrupt or short circuit in the
link between the heating
appliance and the CM737.
Check if the power supply cable
of the heating appliance is
connected.
Check the wiring.
Contact Alfa Laval.
Display is blank
After installing the CM737 no
power to the heating appliance
is supplied and the
rechargeable battery hasn’t
been charged (takes max 1hr
until fully charged).
Check if the power supply cable
of the heating appliance is
connected otherwise contact
Alfa Laval.
The power supply or the
communication link between the
CM737 and the heating
appliance has been interrupted
for more than 8 hrs.
Check if the power supply cable
of the heating appliance is
connected. After the power is
restored the time may need to
be adjusted – otherwise contact
Alfa Laval.
A flashing symbol
appears on the display after the
CM737 being operating for a
period of time
The heating appliance is
showing an error
Press the button, to see the
error code. This fault code
depends on the type of heating
appliance See 4.1 Fault Codes
on the CM737.
A flashing symbol
appears on the display and the
room temperature is replaced
by “—“
Internal fault in the temperature
measuring circuit.
Contact Alfa Laval.

Honeywell CM737 Specifications

General

Brand	Honeywell
Model	CM737
Category	Control Panel
Language	English