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Troubleshooting
Chapter 5. – Troubleshooting
Troubleshooting
Problem Possible Remedies
Burner Does Not Ignite • Make sure that the ON/OFF 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 main controller in the water heater are good. Power switch
inside water heater is on.
• Make sure that the water heater is supplied with water. The unit activates when inlet
water ow sensor detects ow over 0.5 gpm
• Make sure the cold and hot water lines are not plumbed in reverse.
• Ensure the cold water and gas supply lines are open.
• Make sure the water lines are not frozen.
Water is Not Hot Enough • Ensure the temperature setting on the water heater is not too low.
• Ensure the lter in the cold water supply line is not clogged with debris.
• Make sure the water heater is connected to the correct gas supply.
Water is Too Hot • Ensure the temperature setting is not too hot.
• Ensure the lter in the cold water supply line is not clogged with debris.
• Make sure the water heater is connected to the correct gas supply.
Hot Water Temperature Fluctu-
ates at Tap
• Ensure the lter in the cold water supply line is not clogged with debris.
• Make sure the water heater is connected to the correct gas supply.
The Blower Continues to Oper-
ate After Combustion Stops
• This is normal. The blower operates for one minute after combustion has stopped to
purge remaining exhaust gas from the ue.
Cannot Change the Hot Water
Mode Setpoint above 120℉
• This is a safety device to prevent scalding. Hot water temperature over 125℉ can
cause instant severe burns or death.
The Water Heater Makes Abnor-
mal Sounds During Operation
• Ensure the venting installation complies with the installation manual.
• Ensure supply gas pressure is sufcient. Insufcient gas pressure will cause unstable
burner ame and noise.
Water Quality
Damage to the water heater 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.
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