Residential Gas Hydronic Heating System
Residential Gas Hydronic Heating System
Residential Gas Hydronic Heating System
Residential Gas Hydronic Heating System
QVM 9
Series
38
38
38
38
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
■
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
Symptoms
Symptoms
Symptoms
Causes
Causes
Causes
Causes
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
▶
Blown fuse
▶
Replace new fuse
▶
Power failure
▶
Wait until the power is restoreed
▶
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
▶
T
he 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
▶
T
he 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
