Description of functioning
t e c h n i c a l
44
2
3
DHW WORKS BUT HEATING DOESN´T WORK
DHW DOESN´T WORK BUT HEATING WORKS
IN
No
Yes
Yes
Yes
OUT
It´s the right knob out
of summer position?
Room thermostat close?
(J6-wires black and black)
Change water
3-way valve
Is it connector J4 wires
blue-brown closed?
(open tap detector)
Turn it to winter position
No
Check wiring and
connection, if it is OK,
replace the main control
circuit
No
Check Room Thermostat
connections and select
heating enought
temperature
IN
No
Yes
Yes
OUT
There are 2l/min
at the opened tap
Does the 3-way valve
connector turns off?
(j7-wires blue-brown)
Check the wiring and
connections if it is OK,
replace the front panel
circuit or main control
circuit
Check the filter, 3-way
valve, operating water
presure
No
Check wiring and
connection of 3-way
valve, and check if the 3
way valve state changes
when a tap is opened
38
(DHW MICRO SWITCH)
pressure
J4
CH control knob in the
winter setting ?
Room thermostat contacts
closed and calling for heat ?
