TACOCONTROL Z1 S
Faults
Fault description
Cause
Remedy
Personnel
51 HTG setpoint unreached: Active
Heating supply temperature not reached for
3 minutes.
Setpoint reduction to actual value.
Control valve defec-
tive.
Replace the control
valve.
Heating and
sanitary techni-
cian
80 Input remote-off: Active
Remote off is active.
The entire control is inactive.
Heat interface unit
was switched off
externally.
Switch on the heat
interface unit again
using an external
signal.
Operator
Faults without an error message
The following sections describe faults that are not displayed on the
HMI, and how to repair them.
Fault description
Cause
Remedy
Personnel
Domestic hot water or heating
supply is cold.
Supply heat network
is cold.
Check the installation and values on
the HMI.
Operator
No flow on the pri-
mary side.
Check the installation and values on
the HMI. Proceed in the same way as
you would for the “No flow on the
primary side” fault, if necessary.
Heating and
sanitary techni-
cian
No flow on the primary side.
Strainer blocked.
Replace the strainer.
Heating and
sanitary techni-
cian
Valves closed or
defective.
Open or replace the valves.
Heating and
sanitary techni-
cian
Flow sensor is dirty
or defective.
Clean or replace the flow sensor.
Electrician
Prior installation
faulty.
Check the installation of the heat
interface unit.
Heating and
sanitary techni-
cian
Air in the system.
Remove the air from the system.
Heating and
sanitary techni-
cian
HMI does not display any infor-
mation about the heat inter-
face unit.
HMI not correctly
connected.
Reconnect the HMI (
Ä Chapter 6.1
‘Connecting the HMI’ on page 24).
Operator
HMI defective.
Replace the HMI. A new HMI can be
sourced from the supplier.
Operator
Circuit board defec-
tive.
Replace the circuit board ( Ä Chapter
9.4.2 ‘Replacing the circuit board’
on page 35).
Electrician
Internal wiring of
the LAN connection
faulty.
Open the controller and check the
wiring, and replace it, if necessary.
Electrician
34
Operating instructions
05/2024 Item no. 215251 EA no. EA-1291
