46
TROUBLESHOOTING
Table 10.2: Control Board Blocking Error Codes (manual reset):
“E”
CODE
Error Display
Internal
No.
Error Description Corrective Action
A01 IGNITION ERROR 1
Three consecutive unsuccessful
ignition attempts.
1. Watch the igniter through the observation
window.
2. If no spark is present, check the spark electrode
for the proper 3/16" gap.
3. Remove any corrosion from the spark electrode
with abrasive.
4. If spark is present but no flame, check the gas
supply to the boiler. Check for high or low
pressure.
5. If there is a flame, replace flame sensor
6. check if the gas valve is open
7. check gas pressure
A02 FLAME FAILURE 24
Three consecutive flame failures
during one demand.
1. Check gas pressure to the valve while the unit is
in operation.
2. Assure that the flame signal is stable when lit.
3. If the flame signal reads less than 1.7 microamps,
clean the flame sensor and the igniter.
4. If the flame signal continues to read low,
replace it.
A03 OVERHEAT LIMIT OPEN 18 High Temperature Limit open.
1. Check CH, DHW, General Pump Operation
2. Assure that there is adequate flow through the
boiler by checking the status menu and assuring
less than 40°F temperature rise across the boiler.
3. Check thermistor reading on the supply
thermistor. Replace it if necessary.
A04
INTERNAL ERROR GAS VALVE
RELAY
5 Gas Valve Relay Problems. Replace control
A05
INTERNAL ERROR SAFETY
RELAY
6 Safety Relay Problems. Replace Control
A09
INTERNAL SOFTWARE ERR
RAM ERROR
9 Internal Software Error. Replace Control
A09 INTERNAL SOFTWARE ERR 27 Internal Software Error. Replace Control
A09 INTERNAL SOFTWARE ERR 28 Internal Software Error. Replace Control
A09 INTERNAL SOFTWARE ERR 29 Internal Software Error. Replace Control
A09 INTERNAL SOFTWARE ERR 30 Internal Software Error. Replace Control
A10
COMMUNICATION ERROR
E2PROM ERROR
12
No Communication with
E2prom.
Replace Control
A50
RETURN HIGHER THAN
SUPPLY
11
Boiler return water temperature
higher than supply for more than
5 ignition attempts.
1. Check system piping. Assure that the water is
entering the return connection and exiting the
supply connection.
2. Compare the supply thermistor reading to the
temperature gauge, if they don’t agree, replace
the supply thermistor.
A12
SOFTWARE OUT OF DATE
E2PROM OUT OF DATE
10
Contents of e2prom is not
up-to-date.
Replace Control
A13 INTERNAL ERROR 13 Internal Software Error Replace Control
A14 INTERNAL ERROR 14 Internal Software Error Replace Control
A15 INTERNAL ERROR 16 Internal Software Error Replace Control
A16 INTERNAL ERROR 22 Internal Software Error Replace Control
A18 INTERNAL ERROR 19 Internal Software Error Replace Control
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