7369183-0 SIBC R&D VI.52.Q2.02 4 -00
Service Guidelines
AVTQ
Is there a knocking
noise if the hot-water
tapping is stopped?
Yes
Turn-off the district
heating supply.
Is there still a
knocking noise when
the hot-water is
tapped?
System-dependent
fault in the cold-water
side.
Mount a damping
nozzle on the AVTQ,
003L7343
Too low hot-water
temperature?
Yes
Check Ê and Ë
Turn the pilot valve into the
position setting 5 then 1
and back to setting 3.
Is the temperature OK?
Yes
Clean the stainer Dismantle and clean
the pilot valve (seat
and cone)
Yes No
Replace the sensor,
003L7100
Yes No
No effect
Idle temp. too high
Yes
OK
Change sensor
element 003L7100
Replace the
Diaphragm housing
003L7111
OK No effect
Replace the valve
body 003L7107
OK No effect
Is there no hot water?
No
Ê
Check that all the parts
are mounted correctly
according to the
instruction 003R9121,
pilot valve setting 3.
OK
Ë
Check that the system
parameters T
f
≥ T
set
+8°C
∆p
AVTQ
> 0.2 bar.
Check the strainer and
clean it, if necessary.
OK
Dismantle the thermostat
- loosen the top union nut.
Replace the
sensor, 003L7100.
Dismantle the
diaphragm element
Replace the
diaphragm element,
003L7111
Replace the valve
body, 003L7107
OK No effect
OK No effect
003R9114
003R9114
Check Ê and Ë
7369183-0 SIBC R&D VI.52.Q2.02 4-00
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