Install Instructions

61
TROUBLESHOOTING
“A”
CODE
Error Display
Internal
No.
Error Description Corrective Action
A12
SOFTWARE OUT OF DATE
E2PROM OUT OF DATE
10
Contents of e2prom is not
up-to-date.
See Note**
A13 INTERNAL ERROR 13 Internal Software Error See Note**
A14 INTERNAL ERROR 14 Internal Software Error See Note**
A15 INTERNAL ERROR 16 Internal Software Error See Note**
A16 INTERNAL ERROR 22 Internal Software Error See Note**
A18 INTERNAL ERROR 19 Internal Software Error See Note**
A19
FALSE FLAME DETECTED
AFTER SHUTDOWN
20
Flame signal detected 10 sec.
after closing the gas valve.
1. Check flame sensor to be sure there is no short to
ground.
2. Check igniter to be sure there is not short to
ground.
3. This could also indicate that the gas valve doesn’t
close completely.
A20
FALSE FLAME DETECTED
BEFORE IGNITION
21
Flame signal detected before gas
valve opened.
4. Check flame sensor to be sure there is no short to
ground.
Check igniter to be sure there is not short to
ground.
A23 FLOW_SW_NOT_OPEN 25 CH flow switch not working.
1. Check for electrical continuity between wires
connected to terminals 9 & 10 from field supplied
flow switch.
2. If there is continuity when the circulator is off,
there is a system piping or circulator control
problem.
A24 FLOW_SW_NOT_CLOSED 26 CH flow switch not working.
1. Check for electrical continuity between wires
connected to terminals 9 & 10 from the field
supplied flow switch.
2. If there is no continuity, check to be sure the
circulator is working.
3. If the circulator is working correctly, check the
flow switch.
A32 FAN NOT RUNNING 23 Internal Software Error.
A33 FAN SPEED ERROR 8
Fan speed detected is more than
300 rpm different from targeted
value for more than 60 seconds.
1. Is the fan running at full speed?
• Check 4 wire control connection to blower
and control.
• Replace harness.
2. Is the fan running at a modulated speed?
• Check 4 wire control connection to blower
and control.
• Replace harness.
3. Is the fan not running?
• Check the 3 wire power connection to the
blower and control.
• Replace harness.
• Replace Blower.
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.
Table 10.2 (cont’d): Control Board Locking Error Codes (manual reset):
** 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.