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AM Series Boiler & Water Heater User Manual
CHAPTER 9 – OPERATION
9.18 Diagnostics – Display Messages
During normal operation, the following diagnostic information may be shown in the display:
DISPLAY
Heater is performing antifreeze protection operation.
Light Steady On = Indirect water heater enabled Light Blinking =
indirect water heater loading
Light Steady On = Hot water supply enabled Light
Blinking = Hot water supply active
Heater is in Lockout. Press RESET button to unlock the burner. If lockout
happens frequently, have a qualified service technician investigate.
Heater is in blocking error. It is possible to restore the normal operating
conditions only by resolving the problem. If unable to resolve the error, have a
qualified service technician investigate the problem.
9.19 Diagnostics – Lockout (Loc) Errors
Lockout errors will stop the unit from functioning until the error is resolved and the unit is reset.
Refer to the chart below for Lock Errors, with solutions. To reset, perform the following:
1.
When the boiler goes into lockout, the
burner icon(s) (
RESET
2.
Press the
3.
To attempt to reset the unit, press and hold down the
which should return the display to its normal function.
4.
If the unit cannot be reset in this way, consult the table of Lockout error messages below
and attempt to diagnose and resolve the problem before attempting to reset the unit again.
LOC# DESCRIPTION
Flame loss during
ignition.
Loc 1
No flame detected
after five ignition
attempts.
OMM-0100_E • GF-146 • 11/15/2019
Diagnostics Messages
DISPLAY DESCRIPTION
Resetting the Unit after a Lockout Error
,
,
, or
) associated with the lockout will blink.
button once and the lockout error number will show in the display.
Lockout Error Messages
CHECKS
a)
Correct gas supply pressure.
b)
Ignition spark (see section 10.19).
c)
Correct amount of gas (see sections 8.6
and 8.7).
d)
120VAC at the gas valve.
e)
Resistance of the two gas valve coils
should be 0.18 k ohm and 1.1 k ohm.
f)
If the burner lights, but goes out at the
end of the ignition attempt, check: that
the ionization current is set at a value
greater than 3uA (follow procedure in
section 10.8).
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icon will show in the control panel display and the
RESET
button for at least 5 seconds,
a) If the gas supply pressure is incorrect, it must be
adjusted to the correct pressure.
b) If spark is not present, check for correct ignition
electrode position and gap as per section 10.19; If
position is correct, check for 120VAC at the supply
of the spark generator.
c) Inspect the vent system and eliminate any obstructions.
d) If the voltage to the gas valve is not 120VAC the power
control board must be replaced.
e) If the resistance of the gas valve coils is not 0.18k ohm
and/or 1.10k ohm, the gas valve must be replaced.
f) If the ionization current is not greater than 3uA, confirm
that the CO2 content is adjusted properly (see section
8.7). Check the flame detection electrode (section
10.19) and if necessary replace it, check the integrity
of the flame detection electrode electrical wires.
DISPLAY REFERENCE
Supply temperature (°F)
Supply temperature (°F)
Supply temperature (°F)
Lock out code (see Section 9.18)
Blocking error code
(see Section 9.19)
SOLUTIONS
Page 117 of 170
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