57
CONTROL SYSTEM
ALARM CAUSE POSSIBLE ACTION OR CHECK
E42
Outside air temperature
probe fault
1. Probe shorted or disconnected.
2. Temperature outside the probe limits
(-30°C ÷ 90°C).
3. Probe electrical connection faulty or loose.
1. Check the probe as described in the section “Probe characteristics”
and replace it if necessary.
2. With a thermometer check if the temperature is outside the probe
limits.
3. Check the probe electrical connections.If the operating temperature
is correct the probe is not faulty and the alarm remains; the electronic
controller could be damaged.
E43
Internal fan thermal
cut-out
Inlet fan thermal cut-out
1. Electrical connections faulty or loose.
2. Electric motor damaged.
3. Transmission damaged or not correctly adju-
sted.
4. Fan blocked or damaged.
5. Excessive treated air flow.
1. Check the electrical connections inside the electrical panel and in
the electric motor box. Check the electrical panel fuses
2. Check the continuity of the electric motor winding.
3. Check the setting of the fan transmission and belt tension.
4. Make sure the fan blades are not obstructed and that the shaft is
free to turn.
5. Make sure the treated air flow is between the max. and min. va-
lues provided for.
E46
Inlet air high tempera-
ture
Active only in COOLING.
1. Operating temperature outside the operating li-
mits provided for.
2. Incorrect positioning of inlet air temperature pro-
be.
3. Incorrect reading of inlet air temperature probe.
1. Make sure the temperature of the treated air is within the unit's ope-
rating limits.
2. Make sure the inlet air temperature probe is placed in the special
seat.
3. Check the probe as described in the section “Probe characteristics”
and replace it if necessary.
E48
Inlet air humidity probe
fault
1. Sensor damaged.
2. Electrical connection faulty or loose.
1. Check the instrument and replace it if necessary.
2. Check the probe electrical connections (power supply and output si-
gnal).
E49
Outside air humidity
probe fault
1. Sensor damaged.
2. Electrical connection faulty or loose.
1. Check the instrument and replace it if necessary.2. Check the probe
electrical connections (power supply and output signal).
E63
Heaters thermal cut-out
Gas-fired heating modu-
le alarm
1. Insufficient treated air flow.
2. Gas-fired heating module shut-down.
1. Make sure the treated air flow is between the max. and min. values
provided for. Make sure the inlet and outlet ducts are open and free
of obstructions. Check the setting of the internal fan transmission and
belt tension.
2. Consult the specific documentation of the gas-fired heating module
for complete diagnostics.
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