
Appendix
48
Installation and maintenance instructions MicraCom 0020289288_02
Message
Possible cause
Measure
F.83
Fault: NTC temperature fluctu-
ation
Insufficient/no water in the
product.
▶
Fill the heating installation.
F.84
NTC temperature difference is
implausible
Flow temperature sensor in-
stalled incorrectly
▶
Check whether the flow temperature sensor has been installed
correctly.
Return temperature sensor in-
stalled incorrectly
▶
Check whether the return temperature sensor has been in-
stalled correctly.
Flow and return temperature
sensors inverted
▶
Check whether the flow and return temperature sensor has
been installed correctly.
F.85
Flow and return temperature
sensors have been installed
incorrectly (inverted)
Flow/return temperature
sensors have been installed on
the same pipe/wrong pipe
▶
Check that the flow and return temperature sensors have been
installed on the correct pipe.
F.86
External safety shutdown
Limit thermostat settings incor-
rect
▶
Check the limit thermostat settings.
The flow temperature sensor
measures deviating values
▶
Check the flow temperature sensor.
3-port diverter valve blocked
▶
Check the 3-port diverter valve.
Condensate pump defective
▶
Replace the condensate pump.
F.87
Fault: Igniter
Igniter not connected
▶
Check the igniter's connection.
Igniter connected incorrectly
▶
Check the igniter's connection.
Short circuit in the cable har-
ness
▶
Check the cable harness.
F.88
Fault: Gas valve assembly
Gas valve assembly not con-
nected
▶
Check the connection to the gas valve assembly.
Gas valve assembly connected
incorrectly
▶
Check the connection to the gas valve assembly.
Short circuit in the cable har-
ness
▶
Check the cable harness.
F.89
Fault: Pump
Pump not connected
▶
Check the pump connection.
Pump connected incorrectly
▶
Check the pump connection.
Incorrect pump connected
▶
Check whether the pump that is connected is the one that is
recommended for the product.
Short circuit in the cable har-
ness
▶
Check the cable harness.
E
Check programmes
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
Check programme
Meaning
P.00
Purging the domestic hot
water and heating circuit
The function is activated in the small domestic hot water circuit for 4 minutes and then in the heat-
ing circuit for 1 minute. The pump runs and stops at regular intervals. The function is active for
five minutes.
P.01
Start up the burner at the
adjustable heat input in heating
mode
Following successful ignition, the product is operated at the heat input shown in the display. This
value can be set from 0% (
0
= min. output) to 100% (
Hi
= max. output) using
and
. The func-
tion is active for 15 minutes.
P.03
Start up the burner at par-
tial load
Following successful ignition, the product is operated at the partial heat load that is set using dia-
gnostics code
d.00
. The function is active for 15 minutes.
P.04
Chimney sweep function
If there is a domestic hot water demand, the product runs in domestic hot water mode and at max-
imum heat input. If there is no domestic hot water demand, the product runs in heating mode with the
partial heat load that is set using diagnostics code
d.00
. The function is active for 15 minutes.
P.08
Filling or draining the
product
The prioritising diverter valve is moved to the mid-position. To fill or drain the product, the burner and
pump are switched off. The function is active for 15 minutes.
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