Troubleshooting - TESY MultiThermica User's And Installer's Manual

6�1 Troubleshooting Table
Alarm Description
Inlet water temperature probe
ALARM 001
malfunction
Water outlet temperature probe
ALARM 002
malfunction
Domestic water temperature
ALARM 003
probe malfunction
Outdoor temperature probe
ALARM 004
malfunction
ALARM 005 Low water temperature
Low water temperature PT5
ALARM 006 (and PT6 and if enabled PT1) on
standby
Low water temperature in
ALARM 007
standby
ALARM 008 High water temperature
ALARM 009 High water temperature
ALARM 010 Plant flowmeter tripped

TROUBLESHOOTING

Correlated
Cause
variables
Probe disconnected, faulty or
PT6
abnormal value
Probe disconnected, faulty or
PT5
abnormal value
Probe disconnected, faulty or
PT4
abnormal value
Probe disconnected, faulty or
PT8
abnormal value
The minimum frost protection
temperature alarm has triggered.
PT5
The temperature of the exiting
water dropped below 5°C.
The frost temperature alarm has
triggered during the stand-by
PT1, PT5, PT6
state. The outlet water tempera-
ture has dropped below 5 °C.
The frost temperature alarm has
triggered during the stand-by
PT4
state. The outlet water tempera-
ture has dropped below 5 °C.
Inlet water temperature detected
PT5
by PT5 exceeded 80 °C
The domestic water tank
PT4 temperature detected by PT4 has
exceeded 80 °C
The water circulation in the plant
PI1
is not good
TRoUBLESHooTInG
Solution
Check the connection and if necessary replace the probe
Check the connection and if necessary replace the probe
Check the connection and if necessary replace the probe
Check the connection and if necessary replace the probe
• Check that nothing is preventing the good water circu-
lation in the plant (air, partially closed valves, clogged
sieve filter)
• Check that the thermal gradient between the plant
delivery and return is between 4÷7 °C by querying
parameter PT5
• Set a lower circulator speed if the thermal gradient is
lower than 4 °C
• If the thermal gradient is greater than 7 °C, check that
all the valves on the plant are open and if necessary
add an external pump to increase the water flow rate or
insert a hydraulic separator
• During the stand-by state, a dangerous situation devel-
oped that could lead to serious damage to the device.
• If the outside temperature may fall below zero degrees
centigrade, with the likelihood of frost, the hydraulic
plant must be drained or antifreeze liquid (e.g. ethylene
glycol) must be added in the doses recommended by
the manufacturer.
• During the stand-by state, a dangerous situation devel-
oped that could lead to serious damage to the device.
• If the outside temperature may fall below zero degrees
centigrade, with the likelihood of frost, the hydraulic
plant must be drained or antifreeze liquid (e.g. ethylene
glycol) must be added in the doses recommended by
the manufacturer.
• If a boiler is installed in the system check the system's
diverter valves
• If a boiler is installed in the system check the system's
diverter valves
• If a solar collector is present in the system, PT4 in the
hot water tank detects a high temperature but this does
not prevent the production of hot or cold water for the
system
Check that:
• The check valves are open
• the three -way valve for hot-cold diversion (if present) is
in the correct position,
• There are no air bubbles inside the circuit
• At least one of the consumers has an open circuit or is
equipped with a 3-way valve
• The external mesh filter is not clogged
• The plant water pressure is correct
• The circulation pump is working properly (unlock it if
necessary)
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