American Standard TCWH-199-AS Installation Start-Up Maintenance Parts page 56

TANKLESS WATER HEATER
Error Code
Er:10
Er:11
Er:16
Er:20
Er:29
56
Error Code Description
Flame has Extinguished 8 (Eight) Times
Ignition has Failed 10 (Ten) Times
Operating Temperature Sensor or DHW Sensor
detects Water Temperature Greater than 199
º
(93 C)
High Limit Overheat Switch – Closed is Normal,
Open is Fault
APS/Condensate – Closed is Normal, Open is
Fault (Condensate Drain Trap)
Press the Power button to clear the Error Code. If Error happens again:
1. Monitor the gas pressure to the water heater while in operation. Ensure
pressure is between values referred in table 15.
2. Check gas valve wire. Ensure connection is secure.
3. Check flame detection sensor. Ensure connections are secure. Normal
operating settings are more than 2.5DC before ignition, less than 2.5DC
after ignition.
4. Check vent terminations. Ensure there are no blockages.
5. Assure that the flame is stable when lit.
6. If the problem persists, replace the main control.
Press the Power button to clear the Error Code. If Error happens again:
1. Monitor the gas pressure to the water heater while in operation. Ensure
pressure is between values referred in table 15.
2. Check gas valve wire. Ensure connection is secure.
3. Check flame detection sensor. Ensure connections are secure. Normal
operating settings are more than 2.5DC before ignition, less than 2.5DC
after ignition.
4. Check igniter transformer for proper connection.
5. Clean the spark igniter with steel wool to remove oxides. Ensure proper
separation (3-4 mm).
6. Replace the spark igniter if damaged.
7. Assure that the flame is stable when lit.
8. If the problem persists, replace the main control
This Error Code will go away when the DHW temperature decreases.
º If Error happens again:
F
1. Check if dip switch High Fire setting is ON. Switches 6 and 7 should be
OFF for normal operation.
2. Check if DHW pipe is blocked. Ensure there is enough water flowing to
the water heater.
3. Check DHW sensor at DHW outlet. If resistance is zero, replace the
sensor.
4. Check Operating Temperature sensor at the heat exchanger. If resistance
is zero, replace the sensor.
5. If the problem persists, replace the main control.
Press the Power button to clear the Error Code.
1. Inspect the High Limit Overheat switch. Ensure proper connections.
2. Check High Limit Overheat switch resistance. If resistance is zero,
replace the switch.
3. If the problem persists, replace the main control.
Press the Power button to clear the Error Code.
1. Check APS/Condensate and main controller connections. Ensure all are
secure.
2. Check APS/Condensate resistance. If resistance is zero, replace the
switch.
3. Check APS/Condensate hose. Ensure it is connected and in good
condition.
4. Check condensate line and termination for blockages.
5. Check exhaust vent for blockages.
6. If the problem persists, replace the main control.
Possible Remedies