GB - 14
30RHV
Troubleshooting and guide for the owner
Troubleshooting
Unit compressor and fan will not start:
• Unit not energized; check the mains power connections.
• Mains switch OFF; check and put in the ON position.
• Main switch fuses have blown; replace.
• Wait for 2 minutes; compressor cycling protection is on.
• Pressure switch open; check and eliminate cause.
• Mains voltage too low.
• Electrical connections loose or wrong; check and repair.
Compressor will not start, but unit fan is running:
• Electrical connections of compressor loose or wrong; check and
repair.
• Compressor burnt out, seized or protection device open; check
for the cause and replace compressor if necessary.
• Run capacitor faulty (single-phase models); replace.
Compressor starts, but stops due to its overtemperature
protection (other than stops caused by the normal operation
of the thermostat):
• Wrong refrigerant charge (excessive or low) or air or other non-
condensable gases in the circuit; drain refrigerant (see note 1),
evacuate and recharge.
• Mains voltage wrong (too high or too low).
• Condenser coil obstructed; remove obstructions.
• Fan off; check cause and repair.
• Run capacitor faulty; check and replace.
• Indoor unit thermostat faulty; replace.
• Refrigerant circuit clogged; check and remove obstructions.
• Reversing valve faulty in heat pump models; replace.
• Expansion device clogged or covered with ice; drain refrigerant
(see note 1), evacuate and recharge.
Compressor runs continuously:
• Unit selected too small for actual air conditioning needs.
• Water temperature selection too low (if in cooling) or too high (if
in heating, for heat pump models); check temperature selection.
• Refrigerant charge low; check and add refrigerant.
• Outdoor unit fan faulty; replace.
• Air or other non-condensable gases in the circuit; drain
refrigerant (see note 1), evacuate and recharge.
• Obstruction in the air intake or dirty indoor unit filters; remove
obstruction or clean filter.
Frequent ice build-up on coil (during heating with heat pump
units):
• Fan stopped; check cause and repair.
• Wrong electrical connections on defrost circuit; check electrical
connections and repair.
Discharge pressure too high:
• Coil dirty or obstructed; clean or remove obstructions.
• Water flow rate is insufficient or the pump is faulty (during
heating); replace.
• Refrigerant charge too high; drain some refrigerant (see note 1).
• Air or other non-condensable gases in the circuit; drain
refrigerant (see note 1), evacuate and recharge.
Discharge pressure too low:
• Refrigerant charge too low; add refrigerant.
• Coil dirty or obstructed; clean or remove obstructions.
• Water filter dirty; clean filter.
Suction pressure too high:
• Internal high pressure relief valve open; check for cause and
repair.
• Refrigerant charge too high; drain some refrigerant (see note 1).
• Reversing valve (on heat pump models) faulty or internal leak;
replace.
Suction pressure too low:
• Refrigerant charge too low; add refrigerant.
• Evaporator coil (indoor or outdoor in case of heat pump models)
covered with ice; see the following points.
• Air circulation on the evaporator unit not sufficient; check for the
cause and repair.
• Expansion device or suction line clogged: check and repair.
• Fan does not stop during defrost periods (when heating with heat
pump models); check electrical connections.
• Defective defrost probe (heating with heat pump models);
replace.
• Contact between tube and defrost probe (heating with heat pump
models) faulty; check and repair.
Fan cycling due to its overtemperature protection:
• Fan capacitor faulty; replace.
• Electrical connections loose; check connections.
• Fan bearing seized; check and repair.
• Expansion device clogged or covered with ice; drain refrigerant
(see note 1), evacuate and recharge.
Note 1:
Do not release refrigerant to the atmosphere; use
refrigerant recovery equipment.
Guide for the owner
When installation and tests are completed explain the Operation
and Maintenance Manual to the owner, with particular attention to
the main operating modes of the air conditioner, such as:
• Turning the unit on and off.
• Control functions.
In the event of a fault or malfunctioning, check the error code
shown on the remote control or at the LED on the board in the
chiller control panel.
