35
Troubleshooting
Chapter 5. – Troubleshooting
Troubleshooting
Problem
Possible Remedies
Burner Does Not Ignite
• Make sure that the ‘Power Button’ on the Control Panel is ON.
• If the display on the Control Panel is blank, make sure the power cord is plugged
in and 3A fuses on the circuit board in the Combi Boiler are good. Power switch
inside Combi Boiler is on.
• Make sure that the Combi Boiler is supplied with water. The unit activates when
inlet water flow sensor detects flow over 0.5 gpm
• Make sure the DHW cold and Domestic Outlet pipes are not plumbed in reverse.
• Ensure the DHW Cold Water and gas supply valves are open.
• Make sure the water lines are not frozen.
Domestic Hot Water is Not Hot
Enough
• Ensure the DHW temperature setting on the Combi Boiler is not too low.
•
Ensure the filter in the DHW Cold inlet is not clogged with debris.
• Make sure the Combi Boiler is connected to the correct gas supply.
Water is Too Hot
• Ensure the temperature setting is not too hot.
•
Ensure the filter in the DHW Cold inlet is not clogged with debris.
• Make sure the Combi Boiler is connected to the correct gas supply.
Domestic Hot Water
Temperature Fluctuates at Tap
•
Ensure the filter in the DHW Cold inlet is not clogged with debris.
• Make sure the Combi Boiler is connected to the correct gas supply.
The Blower Continues to
Operate After Combustion Stops
• This is normal. The blower operates for three minutes after combustion has stopped
to purge remaining exhaust gas from the flue.
Cannot Change the Domestic Hot
Water Mode Setpoint above 120
℉
• This is a safety device to prevent scalding.
• Domestic Hot Water temperature over 125
℉
can cause instant severe burns
or death.
The Combi Boiler Makes Abnormal
Sounds During Operation
• Ensure the venting installation complies with the Installation Manual.
•
Ensure supply gas pressure is sufficient. Insufficient gas pressure will cause
unstable burner flame and noise.
( ) Is lit.
( ) Is lit even when the DHW/
Heating are not being used.
• The unit automatically operates to prevent freezing.
The room does not get warm.
The heating does not operate.
• Increase Heating Temperature Setting.
• ( ) is lit on the control panel, contact your installer.
No heating when the burner is on.
•
Ensure the heating return filter is not clogged with debris.
• Ensure the circulation pump is working properly and replace, if defective.
Water Quality
Damage to the Combi Boiler as a result of poor water quality is not covered by the Limited Warranty. To ensure full warranty
coverage, treat or condition water that exceeds the target levels provided in this table.
(
Source: EPA National Secondary Drinking Water)
Total Hardness*
200 mg/L (12 gpg) or less
Aluminum
0.05 to 0.2 mg/L or less
Chloride
250 mg/L or less
Copper
1 mg/L or less
Iron
0.3 mg/L or less
Manganese
0.05 mg/L or less
pH
6.5 - 8.5
Total Dissolved Solids
500 mg/L or less
Zinc
5 mg/L or less
Sulfate ion
250 mg/L or less
Residual chlorine
4 mg/L or less
* Maximum limit suggested by Noritz.
Summary of Contents for CB180-DV
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