39
DIAGNOSTICS
Before calling for service, review the following diagnostic steps first for saving time and money!
Question
Answer
1. Make sure that the ON/OFF button on the front or remote controller has been
turned ON.
3. Make sure water is flowing to the unit.
The unit activates once the inlet water flow is over 0.5 gpm.
4. Make sure the cold and hot water lines are not plumbed in the wrong locations.
5. Make sure that the water lines are not frozen.
6. Make sure that the cold water and gas supply lines are opened.
1. Check the setting temperature on the unit is not too low
2. Make sure that the filter in the cold water supply line is not clogged with debris.
3. Make sure that the gas supply type is correct.
5. Make sure that the water flow sensor with three wires has been properly connected.
1. Make sure that the setting temperature on the unit is not too hot.
2. Make sure that the filter in the cold water supply line is not clogged with debris.
3. Make sure that the gas supply type is correct
1. Make sure the filter in the cold water supply line is clean.
2. Make sure that the gas supply type is correct.
3. Check the supply gas pressure is sufficient.
2. Improper venting termination, make sure that the venting termination complies
with specifications.
3. Make sure the supply gas pressure is sufficient. Insufficient gas pressure
will cause unstable burner flame and noise.
1. This is normal because the blower still keeps operating for 1 minute to exhaust
the flue gas from the chamber once the combustion has stopped.
1. This is a safety device to prevent scalding. Hot water temperature
over 125°F can cause severe burns instantly or death.
Water is not hot enough.
Water is too hot.
2. If the monitor on the front or remote controller is blank,
make sure the power cord is plugged in and the 3A fuses on the main
controller in the unit are good.
Burner does not ignite when
the hot water is opened.
4. Check the supply and manifold gas pressures are in accordance with
specifications.
The blower is still operating
after the combustion stops.
I Can't change the setting
temperature to above 140
°
F
on the front controller.
Hot water temperature
fluctuates at the opened tap.
1. A leak of combustion gas between sealed chamber and exhaust
tube inside the unit.
Abnormal sounds come from
unit during operation.
