QVM 9
Series 38
CAUTION
■ 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 Causes Troubleshooting
▶ Blown fuse ▶ Replace new fuse
▶ Power failure ▶ Wait until the power is restored
▶ No indication on the
water temperature
indicator
▶ Check circuit breakers
▶ Room temperature is higher than the set
temperature
▶ Increase the set temperature at the
room thermostat
▶ Set temperature at the unit
thermostat is low
▶ Increase the set temperature at the
thermostat
▶ Temperature is indicated
but the unit does not
work
▶ “02” is indicated on the
temperature indicator
▶ No water in the heating pipe
▶ Water filling valve failure
▶ No tap water supply
▶ Fill the heating water
▶ Contact the service center
The unit does
not work
▶ “01” is indicated on the
temperature indicator
▶ Clogged heating pipe
▶ Circulation pump failure
▶ 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
▶ Low or no gas pressure ▶ Contact for service
▶ No flame detection ▶ Contact for service
▶ Intermediate valve closed ▶ Open the valve
▶ When the unit is started, the ignition
fails and the check lamp comes “ON”
▶ No ignition ▶ Contact for service
▶ Air pressure switch tube disconnected ▶ Connect the tube
▶ Incorrect installation of flue ▶ Correct the wrong installation
▶ Ignition fails and the exhaust fan runs
continuously
▶ Clogged flue exhaust pipe ▶ Check the smoke stack
▶ Closed valve on the heating line or
clogged pipe(Heating water)
▶ Check the heating pipe(strainer)
▶ Air in the heating pipe ▶ Purge the air from the piping
▶ Circulation pump does not work ▶ Contact for service
▶ The unit runs properly but heat
performance is poor
▶ Leak in heating pipe ▶ Fix the leak
▶ Low water pressure ▶ Install a pressurizing pump
▶ Circulation pump does not work ▶ Contact for service
▶ The unit runs normally but hot water is
not supplied
▶ Defective 3-way valve ▶ Contact for service
▶ Pressure falls
▶ Leakage in piping ▶ Contact for service
▶ Installation of flue duct ▶ Contact for service
▶ Loud noise during the ignition and
combustion
▶ Clogged flue pipe(s) ▶ Contact for service
▶ Clogged hot water line
▶ Clean the strainer at the inlet of the hot
water flow switch
▶ Hot water supply stops
▶ Defective hot water flow switch ▶ Contact for service
Troubleshooting
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