Troubleshooting - Riello NUOVO ACU Series Technical Information Assembly, Use And Maintenance Instructions

PROBLEM
THE FAN DOES NOT START
POOR HEATING EFFICIENCY
NOISE OR VIBRATION

TROUBLESHOOTING

CAUSE
 No power

Main switch turned to OFF

Room thermostat faulty

Fan faulty

Condenser faulty

Overload cut-out tripped
 Heat exchanger dirty

Airflow obstructed

Improper room temp. setting

Wrong water temperature

Air in water circuit

Fan faulty

Fan rotation inverted

Contact between metal parts

Screws loose

Fan improperly balanced

Fan dirty
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SOLUTION
 Check unit is powered

Turn to ON

Check room thermostat
 Check fan motor
 Check condenser
 Check absorption
 Clean exchanger
 Remove obstruction
 Check regulation
 Check water temperature
 Bleed air from system
 Check fan motor
 Check direction of fan rotation

Inspect for contact

Tighten
 Replace
 Clean