Navien CH-180, Руководство по обслуживанию, Страница: 110 / 155

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5.28. Troubleshooting guide by symptom
5.28.1. Noise
Error type Cause Check method
Regular noise occurs.
Noise of motor running continuously due to defective 3-way valve
MICRO s/w.
Motor rotation noise.
Replace the 3-way valve.
Incorrect setting of Gas differential pressure.
Adjust differential pressure with the pressure adjusting screw on
the main gas valve.
DIP S/W 1,2 ON (Stage 3 MIN), 17±1
̀
H
Њ
O (210/240 model)
If noise occurs at standard value, adjust setting above/below the
standard.
Excessive gas supply due to defective proportional valve on the
main gas valve.
Replace the main gas valve.
Gas supply error due to defective air pressure sensor.
Defective PCB.
Exhaust gas flown into the boiler through the air intake makes
combustion noise.
Check the distance between intake and exhaust.
Check the distance between exhaust pipes if two or more units
are installed.
Check if there is any obstacle near the exhaust pipe.
Noise occurs due to flame lifting when gas pressure is low.
Check the gas supply pressure.
Low gas supply due to incorrect setting differential pressure.
Disassemble the nozzle and check if the hole is narrowed due to
debris.
Set DIP S/W 1, 2 to ON (3-stage MIN), and check the flame.
Compare flame of Burner at combustion section of stages 1, 2
and 3. Check the nozzle if there is a comparatively unbalanced
burner section.
Noise due to defective air pressure sensor.
Replace the air pressure sensor.
Noise due to torn air pressure hose.
Noise may be intermittent depending on the size of the damage.
How to check boiling noise: Raise the water temperature to 158 ı
(70
ç
), and check the noise.
Vibration
noise
Regular
noise
Noise at
ignition
Noise
during
combustion
Defective of
installation
Fan motor
vibration
noise
Noise from
operation of
3-way valve
Boiling noise
(Beep~)
Gas and air
differential
pressure
error
(Pop~,
Beep~,
Explosive
ignition)
Low gas
pressure
(whirring~)
Noise from
burner
stage
switch
Noise during
combustion
Incorrect level setting or fixing error
Check the fixing state, and reinstall the unit.
Vibration caused due to defective the fan motor balance.
Touch the fan. If vibration is significant, replace the fan motor.
If intermittent noise occurs during operation, check the fan
motor.
If vibration noise occurs during operation of the product, and
stops when the case lid is removed, check he fan motor.
© Navien Ameri c a I n c . 20 1 0 CH series servi c e Manua l Version 1 .0