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Mascot ST Tankless Water Heater
Section 6, Error Codes
Error
Error Code Description
Code
Ignition has Failed
11
10 (Ten) Times
Operating
Temperature Sensor
or DHW Sensor
16
detects Water
Temperature Greater
than 199°F (93°C)
High Limit Overheat
Switch – Closed is
20
Normal, Open is
Fault
APS/Condensate
– Closed is
Normal, Open is
29
Fault (Condensate
Drain Trap)
Inlet Water Sensor
31
Open or Short
DHW Sensor Open
32
or Short
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 3.5 and 14" WC.
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.
If Error happens again:
1. Check if dip switch MAX 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.
This Error Code will go away when inlet water temperature decreases.
If Error happens again:
1. Check inlet water temperature sensor. Ensure connections are secure.
2. Check sensor resistance. If resistance is zero, replace the sensor.
3. If the problem persists, replace the main control.
This Error Code will go away when outlet water temperature decreases.
If Error happens again:
1. Check DHW outlet temperature sensor. Ensure connections are secure.
2. Check sensor resistance. If resistance is zero, replace the sensor.
3. If the problem persists, replace the main control.
Possible Remedies
Page 47
6.1 Error Codes
Recover
methods
Hard Lock
Soft Lock
Hard Lock
Hard Lock
Soft Lock
Soft Lock
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