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CHECK GAS SUPPLY PRESSURE:
1) Close the manual gas inlet shut off valve on the
gas supply line.
2) Open a faucet. The unit should turn on and the
gas in the pipe line should purge. Leave the
faucet on to keep the unit running until it shuts
down due to lack of gas, and then shut the
faucet off. Ignore any error codes that may
occur at this time.
3) Remove the screw for the pressure port located
on the gas inlet shown on the right.
4) Connect a manometer to the pressure port.
5) Slowly re‐open the manual gas valve. Check to
see that there are no gas leaks.
6) Open some of the fixtures that use the highest flow rate to activate.
7) Check the inlet gas pressure. Appropriate pressures are listed in the specification page in
the installation manual.
PURGE THE GAS LINE OF AIR:
1) The unit should not be running during this procedure. Turn off power to the unit.
2) Turn the gas valve to the off position (perpendicular to the gas line).
3) Loosen the gas line on the unit side of the gas valve (at a flare fitting or union).
4) Next open the gas valve very slightly until you can smell gas by wafting the air towards your
nose. This means any air previously in the gas line has been removed and only gas remains.
5) Turn gas back off and re‐tighten gas line.
6) Turn gas back on and check for leaks. Spray water & dish soap mixture onto fittings. No
bubbles means there are no leaks.
CHECKING MANIFOLD GAS PRESSURE:
1) Ensure the unit is not in operation.
2) Remove the screw off the manifold port.
3) Connect a manometer to the manifold port using
a tube. Ensure that this connection is secure
enough to prevent gas leak.
4) Run water through the unit to activate its
operation. It is suggested that a large amount of
flow is drawn in order to prevent overheating
during max burn. If presence of a gas leak is
detected, immediately shut off the unit and
inspect the tube/manifold connection; otherwise,
proceed onto the next step.
5) To check the manifold gas pressure during maximum combustion, press and hold the "MAX"
button on the computer board. To check the manifold pressure during minimum
combustion, press and hold the "MIN" button on the computer board. The desired
pressures are listed in the specification table at the beginning of this manual.
6) If the manifold pressures do not match up with those listed, adjust the manifold pressure
(see the following procedure).
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Figure 21
Figure 22
Page
Troubleshooting Guide
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