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SUF SERVICE HANDBOOK
ERROR CODES
State Water Heaters Technical Training Department
Ashland City, Tennessee © 2004
39 STC-077
ERROR CODES
CODE INDICATION
00 This is normal operation, 00 is displayed each time the heater is powered up.
01
Indicates the pressure switch circuit was not open during the prediagnostic system
check when the proper state of the Draft Prover Switches are verified. The Blower
Prover Switch is normally open, the circuit should therefore be open during the
prediagnostic system check at the beginning of each cycle. Check Blower Proving
Switch for continuity with the blower off, there should be no continuity, check
pressure switch wiring.
02 Indicates the heater failed to light after 3 trials. Check ignitor, gas pressure.
04
Indicates the ECO is open. Check water temperature in tank, ECO will open at 202°
F and can be reset below 160° F.
05
Indicates a Temperature Probe is open. Check both probes for proper resistance
and continuity.
11
Indicates the Pressure Switch Circuit did not close after blower was energized.
Check normally open Blower Prover Switch operation, check normally closed
Blocked Outlet, Inlet, and Low Gas pressure (SUF 240 only) to ensure they remain
closed. Check for blocked vent pipe (s) or if equivalent feet venting limits have been
exceeded.
15
Indicates temperature sensed by probe(s) is out of bounds, reading is less than
30° F. Check resistance of temp probes, check water temperature in tank.
22
Indicates Ignition Relay failure. Should be off and it is on. Try resetting, turn power
off and on, if code remains, replace board.
25
Indicates temperature sensed by probe(s) is out of bounds. Reading is more than
220° F. Check resistance of temp probes, check water temperature.
CODE #S
ABOVE
199
Internal software or hardware errors, electrical line noise can cause erratic
operation and these error codes. Try adding a “line filter” (available from electrical
suppliers) to the 120 VAC power supply. If these errors codes persist or the control
cannot be reset, replace the control board.
All these errors cause a “soft” lockout with the exception of 04 -
ECO, which is a “hard” lockout. Soft lockouts will reset automati-
cally after 60 minutes or if the reset button is pushed at any time.
The ECO lockout, error code 04 will have to be manually reset by
pushing the rest button after water in the tank has cooled below
160° F.