Troubleshooting - Quietside QVM 9-090W1-NG Manual

■ If any failure occurs, check the following before contacting a service or a dealer.
■ If the check lamp comes "ON" and the failure code is displayed, take proper actions and then restart the unit.
(Re-plug in the unit or turn the unit "ON" few minutes after the check lamp has come "ON")
■ If such procedure does not work, contact the nearest service center.
■ Certain non hazardous failures will shut down the unit, but will not illuminate check light. Press ON/OFF button
to obtain error code.
Symptoms
▶ No indication on the
water temperature
indicator
▶ Temperature is indicated
but the unit does not
work
▶ "02" is indicated on the
The unit does
temperature indicator
not work
▶ "01" is indicated on the
temperature indicator
▶ When the unit is started, the ignition
fails and the check lamp comes "ON"
▶ Ignition fails and the exhaust fan runs
continuously
▶ The unit runs properly but heat
performance is poor
▶ The unit runs normally but hot water is
not supplied
▶ Pressure falls
▶ Loud noise during the ignition and
combustion
▶ Hot water supply stops
QVM 9
Series

Troubleshooting

CAUTION
Causes
▶ Blown fuse
▶ Power failure
▶ Room temperature is higher than the set
temperature
▶ Set temperature at the unit
thermostat is low
▶ No water in the heating pipe
▶ Water filling valve failure
▶ No tap water supply
▶ Clogged heating pipe
▶ Circulation pump failure
▶ Low or no gas pressure
▶ No flame detection
▶ Intermediate valve closed
▶ No ignition
▶ Air pressure switch tube disconnected
▶ Incorrect installation of flue
▶ Clogged flue exhaust pipe
▶ Closed valve on the heating line or
clogged pipe(Heating water)
▶ Air in the heating pipe
▶ Circulation pump does not work
▶ Leak in heating pipe
▶ Low water pressure
▶ Circulation pump does not work
▶ Defective 3-way valve
▶ Leakage in piping
▶ Installation of flue duct
▶ Clogged flue pipe(s)
▶ Clogged hot water line
▶ Defective hot water flow switch
38
Troubleshooting
▶ Replace new fuse
▶ Wait until the power is restored
▶ Check circuit breakers
▶ Increase the set temperature at the
room thermostat
▶ Increase the set temperature at the
thermostat
▶ Fill the heating water
▶ Contact the service center
▶ Check for any clogging in the heating
pipe. If the pipe is clogged, contact the
unit installer
▶ Clean the heating strainer
▶ Check the circulation pump
※ After removing the cause, press the
"HEAT ON" button again
▶ Contact for service
▶ Contact for service
▶ Open the valve
▶ Contact for service
▶ Connect the tube
▶ Correct the wrong installation
▶ Check the smoke stack
▶ Check the heating pipe(strainer)
▶ Purge the air from the piping
▶ Contact for service
▶ Fix the leak
▶ Install a pressurizing pump
▶ Contact for service
▶ Contact for service
▶ Contact for service
▶ Contact for service
▶ Contact for service
▶ Clean the strainer at the inlet of the hot
water flow switch
▶ Contact for service