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INSTALLATION
PRIMO PILOT
MANUAL
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27
Display
Error
Possible causes / Repair
Consequences
Reset
hp o utput.
Overheating at HP outlet
The temperature at the heat pump outlet is abnormally high
- Check status of th fi lter (clean the fi lter)
- Ensure that circulator provides suffi
cient fl ow rate to the heat
pump
- Check the good operation of circulators 1 and 2 (option)
heat pump stopped
automatic
hp o utput
ERR
Multiple overheatings at HP
outlet
- Drop in fl ow rate when traveling through the heat pump
- Reapeated heating requests for low heating needs (installation
design)
heat pump stopped
manual
cp1 power
Compressor 1 power supply
error
There is a problem with the power supply to the compressor
(cable,...)
heat pump stopped
manual
cp2 power
Compressor 2 power supply
error
There is a problem with the power supply to the compressor
(cable,...)
heat pump stopped
manual
evap. senso.
Defrosting sensor error
Error when measuring the evaporation temperature
- Check the condition of air sensor and low pressure sensor
- Check the good switching of 4 ways valve
- Ensure that the compressor smart starter is not in default (only for
models equipped with a smart starter)
- Ensure that evaporator temperature sensor is not surrounded
by ice (only for models equipped with a temperature sensor on
evaporator)
heat pump stopped
manual
ext. senso.
diag
Exterior sensor placement error
- The exterior sensor is badly positioned and is being infl uenced by
heat or cold sources
- The exterior sensor or the air sensor is defective
informative
message
manual
PRES Sure
Lack of water pressure
Water pressure is less than 0.3 bars
- Water pressure in the circuit must be over 0.5 bar at cold
temperature
- Check the heating circuits watertightness and repair the possible
water leaks
- Bleed the air from the upper parts of the pilot
- Check that the heat pump safety valve is not leaking
- Check that the pilot safety valve is not leaking
- Ensure that expansion vessel is large enough for the installation’s
mater capacity
complete stop
automatic after
pressure is returned
cp1 ramp
Temperature ramp is insuffi
cient
for Compressor 1
- Compressor blocked or error in power supply (cable,
voltage)
- Defrosting valve blocked
HP stopped and
restart
(with anti-short
cycle)
automatic
cp2 ramp
Temperature ramp is insuffi
cient
for Compressor 2
- Compressor blocked or error in poiwer supply (cable,
voltage)
- Defrosting valve blocked
HP stopped and
restart
(with anti-short
cycle)
automatic
REPR OG /
PILOT / hp
Reprogramming error
An error is detected on the reprogramming circuit on one the bus’s
circuit boards
- Reprogram the controllers (pilot and heat pump)
- If default remains, reprogramming has to be done at the factory
informative
message
automatic after repair
cuto. lpre
Low pressure error
- The set temperature for heating during colder months is too low
- Ensure that nothing is covering the heat pump evaporator nor is
blocking the heat pump fan
heat pump stopped
automatic
cuto. lpre
ERR
Low pressure error
- Check the good operation of the heat pump fan
- Check the condition of the evaporator surface and remove
anything that could impede the air fl ow throughout the fi ns
(leaves of else)
- In the event of total freezing, stop the heat pump and let it melt.
Sprinkle with water if needed.
- The set temperature for heating during colder months is too low
- Problem with refrigerant fl uid load
- Cause could be a default on defrosting check valve or on
thermostatic valve
Maintenance on fl uid circuit must be done by a qualifi ed engineer
heat pump stopped
manual
