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BTH COMMON ERROR CODES -
Code 04 - ECO Open
Code 02 - Ignition fail after
3 attempts
Code 05 - Open
Temperature Probe
Code 11 - Pressure switch
fail
Codes higher than 199 -
Solid "00" or "01" -
Condensate tee
OTHER SERVICE HINTS
Condenstate tee
Chattering gas valve
Noisy heater
A. O. Smith Water Products Company
Irving, Texas 2000©
BTH ERROR CODES
The hi-limit has been tripped or is malfunctioning -- Try to reset the ECO. Test
to see if ECO is malfunctioning. Also make sure to test the lower temp probe
for continuity. If it has failed the unit may be stacking
Has failed to ignite after 3 tries -- Could be a gas pressure problem,
condensate tee, or venting.
Open temperature probe -- the upper temperature probe is malfunctioning
(not the lower probe). Test for continuinty thru upper temp probe. An open
circuit means the upper probe and its wiring needs to be replaced. If
continuity is present, check connections to replace board.
Pressure switch fails to close/open after 5 minutes -- Check condensate tee
and venting. Jump switch temporarily, or test wiht manometer. 90% of the
time its going to be a problem with condensation or venting installation
problem. (too long, too short, manifold venting)
These are software errors -- the electric noise is causing unnecessary lockouts.
Replace the board.
The first number which comes up is "00". If the heater is stuck on the startup
process, you'll get the solid 00. This is an indication that the condensate tee
is clogged.
BTH produces quite a bit of condensation. If the tee is not installed properly
or kinked or plugged or is going up hill, the venting will fill up quickly and the
problem may be registered as another error.
Low or High supply gas pressure. Possibly plugged condensate hose.
Short runs on the venting can increase noise. By adding a few elbows
in the venting or extending the run, the noise will diminish. The muffler
will help. Using 4" vent - if possible - may also help.
36
Service Handbook
Training Department
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