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10
Information for Troubleshooting
Warning! Before opening the housing the unit must be disconnected from the mains!
The regulator was designed to be continually used for several years. Nevertheless, faults may occur.
Most of the time, the fault’s cause is not sought in the regulator, rather in the peripheral system
elements. The following description of a few common faults should help the installer and the operator
to isolate the fault and activate the system as quickly as possible to avoid unnecessary costs.
Naturally, not all possible faults can be listed. However, you will find the most common causes of faults
that cover the majority of the fault conditions related to the regulator. Send the regulator in after you
have first ensured that none of the described malfunctions have occurred.
One or more pumps are not running even though their switch-on requirements have been met.
Secondary condition:
Possible cause:
Readout on LCD display disappeared
No power supply, possibly a defective fuse or
feeder
"Manual operation" submenu selected
Switch pump(s) manually to OFF
Error displayed in the menu ´Operating status´
(e.g. short circuit, disconnection)
Sensor line or sensor defective or disconnected
For safety reasons the control-related outputs are
switched off with sensor errors.
Relay R3 or R4 can be heard clicking but
output remains dead
Fuse burnt-out or defective
Relay R4 can be heard clicking but output
remains dead
Check if a terminal jumper
(fig.4, page 7) may be required
Pump / 3-way valve on R4 is not responding even though the switch-on conditions have been
met.
Secondary condition:
Possible cause:
The relay can be heard clicking but output
remains dead
No terminal jumper connected
(see Chapter 2.3, fig.4)
Fuse burnt-out or defective
When using a 3-way switch valve
Switch valve not connected properly
(the continual phase L1 must be connected as well as
N and R4)
