TESY MultiThermica User's And Installer's Manual page 46

TRoUBLESHooTInG
Alarm Description
Malfunctioning of condensing
ALARM 011
unit
Anti-legionella cycle terminated
ALARM 012
after LTO timeout exceeded
Plant temperature probe
ALARM 013
malfunction
ALARM 014 Low water temperature
ALARM 015 Low water temperature
Noise and turbulence is coming
-
from the hydraulic circuit
- Unsatisfactory cooling or heating
1. Note:
2. In general, alarm resetting is automatic when the activation condition is
established again.
3. The activation or reset conditions must remain for a preset time (e.g. 30 s)
before the alarm is activated or deactivated on the display. The duration
of the preset time depends on the alarm type.
4. If the alarm trips multiple times in a given time (e.g. 3 times in 1 hour), it
must be reset manually by the Technical Service Centre.
46
Correlated
Cause
variables
• The alarm P05 appears on the
control panel of the outdoor
unit on size 15 or 18. (Size
18 refers to the Indoor Unit
-
Without Integrated Water
Tank indoor unit only).
• The outdoor unit is not work-
ing properly.
The anti-Legionella cycle ended
- in-correctly after 5 hours instead
of holding 60°C for 2 hours.
Probe disconnected, faulty or
PT1
abnormal value
The minimum frost protection
temperature alarm has triggered.
PT1
The temperature of the exiting
water dropped below 5°C.
The minimum frost protection
temperature alarm has triggered.
PT6
The temperature of the exiting
water dropped below 5°C.
- There is air inside the circuit
• The setpoint set on the
controller is too low (heating
mode) or too high (cooling
mode)
- • The control panel is regulated
to too high a temperature
for cooling (or too low for
heating)
• Open doors and/or windows
Solution
• Invert two of the three-phase power phases.
• Check on the control panel of the outdoor unit the
meaning of the alarm
• Contact the Technical Service Centre
• The auxiliary heater (resistor or backup boiler) is not
available or the power is not sufficient for perform the
function
• Contact the installer
Check the connection and if necessary replace the probe
Check that:
• There is nothing to prevent good water circulation in the
system (air, partially closed valves, clogged mains water
filter, etc.)
• Check that the thermal gradient between the plant flow
and return is between 4÷7 °C by querying parameter
PT1
• 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
Check that:
• There is nothing to prevent good water circulation in the
system (air, partially closed valves, clogged mains water
filter, etc.)
• Check that the thermal gradient between the plant flow
and return is between 4÷7 °C by querying parameter
PT6
• 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
• Vent the air via the external devices and the vent on the
buffer tank of the machine and bring the circuit to the
correct pressure
• Check that the suction pressure (hydraulic circuit return)
with the pump on is higher than 0.6 bar.
• Reset according to needs
• Adjust the temperature to a suitable value
• Close them to prevent air from entering