20 Troubleshooting
If resetting the boiler and attempting the remedies suggested below do not resolve the problem, contact an authorized technician, a licensed
professional, or Technical Support at 1-800-519-8794 for service instructions.
Problem
Possible Cause(s)
What to do
No water comes out when the hot
water tap is opened.
●
Is the cold water inlet filter clean?
●
Is an error code displayed on the front panel?
●
Is the boiler frozen?
●
Ensure that the shut–off valves on the hot and
cold pipes are open.
●
If an error code is displayed, refer to
“5.2 Understanding Error Codes” on page 21.
The water from the hot water faucet
is cold or turns cold and stays cold.
●
Is the hot water faucet open wide enough
draw at least 0.5 gallons of water per minute
(GPM) through the boiler?
●
Is an error code displayed on the front panel?
If an error code is displayed, refer to
“5.2 Understanding Error Codes” on page 21.
The water from the hot water faucet
is not hot enough.
Is the set temperature too low?
●
Check the boiler’s temperature setting. Refer to
“3.2 Adjusting the Temperature” on page 9.
●
Check for cross piping between the cold and
hot water lines.
The water from the hot water faucet
is too hot.
Is the set temperature set too high?
Check the boiler’s temperature setting. See “3.2
Adjusting the Temperature” on page 9.
Space heating side malfunction
Is the setting temperature too low?
Check the boiler’s temperature setting. See“3.2
Adjusting the Temperature” on page 9.
Is there power to the system, or is the system in
stand by?
Make sure the power is on, and plugged into the
outlet with the correct voltage. Press the Power
button and raise the setting temperature. Make
sure the boiler is turned on.
Is the system running for domestic hot water
(DHW)?
When the unit is heating for DHW, the heating
side does not work.
Is the filter on the heating side restricted?
Clean out filters that belong to the heating side.
5. Troubleshooting
5.1 Solving Basic Problems
If you experience a problem with the boiler, refer to the following
chart for possible remedies. Error codes that appear on the front
panel display are explained in the following section.
For minor problems, resetting the boiler may resolve the issue. To
reset the boiler, press the Back button (
) on the front panel.
Summary of Contents for NFC Series
Page 26: ...Memo...
