Install Instructions

60
TROUBLESHOOTING
Table 10.2: Control Board Locking Error Codes (manual reset):
“A”
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, check the flame signal ignition
log in the Installer Menu. If values for flame signal
are less than 3.1 µA, check wiring connections
and clean the harness connector at the control.
6. Determine if gas valve is opening by monitoring
gas pressure.
7. Check gas presure.
A02 FLAME FAILURE 24
Three consecutive flame failures
during one demand.
1. If boiler sparks, lights briefly and then goes out:
a. Disconnect the flame sensor cable and then
retry ignition.*
b. If the flame stays lit, allow the boiler to run for
several minutes and then reattach the cable.*
c. If the problem persists, remove the flame
sensor and inspect the burner through the
sensor opening. If metal fibers are protruding
from the burner, use a blunt probe to move the
fibers away from the sensor.
d. If the problem is still present, replace the flame
sensor.
2. If the unit locks out on flame failure during
normal operation:
a. Check gas pressure at the inlet to the gas valve
(See figure 5.2) while the boiler is operating.
b. Check the flame signal in the Installer Menu
under Status. This will also show the total
number of flame failures. If the flame signal
reads less than 2.8 µA, clean the sensor and
igniter. Be sure that the wiring harness is fully
seated at the control.
c. If the flame signal is consistently low, check the
signal with the sensor disconnected. If the
flame signal improves, replace the flame sensor.
A03 OVERHEAT LIMIT OPEN 18
High Temperature Limit Open
(Set Temperature 205°F)
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. See Note**
A05
INTERNAL ERROR SAFETY
RELAY
6 Safety Relay Problems. See Note**
A09
INTERNAL SOFTWARE ERR
RAM ERROR
9 Internal Software Error. See Note**
A10
COMMUNICATION ERROR
E2PROM ERROR
12
No Communication with
E2prom.
See Note**
** If persistent locking errors, A04 through A18, occur, systematically disconnect all wires that were not supplied by the factory with the exception
of the power supply (CH T?stat, DHW T?stat, LWCO and Pumps). If the error code goes away, determine if there may be feedback from one of
the circuits. If the Error occurs with all of these disconnected, there is likely a problem with the control board.