Download Modulating Boiler Sequence Controller (OpenTherm)

Honeywell
Fault
Flow temp
Fault
Flow temp setp
Fault
Frost protection
Fault
Frost prot flow
Fault
Frost prot room
Fault
Hot water temp
Fault
HWS secondary-T
105
Troubleshooting Faults reported by Functions
Cause
: Sensor not or incorrectly connected
or defective.
Consequence : The features which utilize the flow
temperature become inoperable.
Action
: Check the wiring and possibly the
sensor using the resistance table (see § 8.6.).
Cause
: The flow temperature does not
reach the required value minus the set differential within
the set time.
Consequence : The Function continues operating as
normal.
Action
: Check the installation. Adjust the set
time and/or differential, if necessary. Reset the alarm by
pressing
twice.
Cause
: The HWS secondary temperature
drops below 5 °C.
Consequence : A heat demand is generated. The
setpoint flow temperature is set to at least the minimum
value set in the event of a frost hazard.
Action
: Check the installation.
Cause
: The flow temperature is so low that
there is a risk of freezing (e.g. of pipes).
Consequence : A heat demand is generated. The
setpoint flow temperature is set to at least the minimum
value set in the event of a frost hazard.
Action
: Check the installation.
Cause
: The room temperature is so low that
there is a risk of freezing (e.g. of radiators).
Consequence : A heat demand is generated. The
setpoint flow temperature is set to at least the minimum
value set in the event of a frost hazard.
Action
: Check the installation.
Cause
: The boiler reports the fault to the
OpenTherm Boiler Function.
Consequence : The OpenTherm Boiler Function
reports the fault to the Plant Control Function.
Action
: Check the boiler.
Cause
: Sensor is not connected, incorrectly
connected or defective.
Consequence : The storage recovery stops.
Action
: Check the wiring and possibly the
sensor using the resistance table (see § 8.6.).
Part III: References