35
QVM 9
Series
Error Code
Cause Troubleshooting
01 / Overheat y Clogged / Reduced flow in heating
system
y Circulation pump failure
y Check strainer clean if required
y Check system for flowrate
y
Check pump for operation–115V AC, 1 Amp
02 / Low Water Level y No water in system / Pump failure
y No make up water supply
y Water fill valve failure
y Check system / Check pump
y Check system
y Check system 5V DC- input signal
03 / Ignition Failure y Check ignition transformer
y Check high limit sensor / fuse
y No gas supply
y Air pressure switch tripped
y Input 115V AC
y N/C contacts
y Check gas connection
y Check gas valve
y Check tube for connection
y Check flue for blockage
04 / Flame Sensor y Low gas pressure
y Fan failure/Airflow pressure switch
y Check gas valve
y Check gas pressure
y Check fan for operation
y Check switch, flue for obstruction
05 / Heating Sensor Wire
Disconnected
y Check molex connection y Re - connect
06 / Heating Sensor Short
Circuit
y Not applicable
07 / Hot Water Sensor Wire
Disconnected
y Not applicable
08 / Hot Water Sensor
Short Circuit
y Sensor failure y Check voltage Pin #19&8 on 21Pin
connector, main controller 5V DC
09 / Fan RPM Failure y Fan failure
y Check speed control
y Check fan for operation. Input voltage 7
– 40V DC. Red-Black wires
10 / Air Pressure Switch
Failure
y Fan failure
y Air flow switch failure
y Blocked flue
y Excessive wind gusts
y Check fan for operation
y Check tube connection
y Check voltage 5V DC
y Check flue for blockage
y Check flue termination - relocate
11 / Water level Detection
Failure
y Check water fill valve y Voltage 5V DC
12 / Flame Failure y Low gas pressure
y Fan failure / Air pressure switch
y Blocked flue
y Check gas pressure
y Check gas valve
y Check fan for operation
y Check tube on air pressure switch
y Check air pressure switch – 5V DC
y Check flue for obstruction
13 / Heating Water Switch
Failure
y Faulty switch y Check voltage – 5V DC on Pin #10 on 13
pin and Pin #17 on 21 pin connectors
14 / Gas Alarm (Optional) y Check if connected
(Red / Black wire)
y Re – connect
y Check gas supply
y Check voltage 5 – 20V DC
15 / Micom Failure y Check connection from t-stat to unit
y Replace t-stat or micom controller
16 / Mechanical Overheat y Pump motor overheat
y Fan motor overheat
y Check for pump operation 115V AC,
approx 1A (dependent on flow rate)
y Check fan for operation
y Check rotation
17 / DIP Switch Setting y Incorrect settings y Check setting especially for 090/125/150
water heater
Troubleshooting
-
Error Codes
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