• To maintain the system temperature the operating aquastat
will cycle the burner off at 170 F (77C) and on again at 149F
(65C).
• If the heater cools and fails to resume operations and the
diagnostic code continues to be displayed, the aquastat is
faulty or has an open connection.
10.7 - Thermostats off (Normal Operation)
All thermostats and aquastats are satisfied.
• The burner will shut down.
• The diagnostic code will be displayed.
• The control board will purge the system with the combustion
fan and circulating pump for two minutes. When any
thermostat or aquastat calls for heat, the heater will resume
normal operation.
• If the heater fails to resume operations, check the thermostat
and their connections.
10.8 0 - Voltage Low or High
The battery or power supply voltage is below 11Vdc or above
15Vdc
• The burner will shut down.
• The diagnostic code, 0 will be displayed.
• The buzzer will sound for 10 seconds.
• The control board will purge the system with the
combustion fan and circulating pump for two minutes while it is
checking if the voltage fault is still present.
If the voltage fault has cleared, the control board will reset the
alarm and restart the burner. If the condition has not cleared by
the end of the purge period, the diagnostic code 0 will remain
displayed. The control board will continue to check the voltage
every half hour until the voltage fault has cleared and then restart
the burner. To manually reset the fault, switch the service switch
or the remote panel switch OFF then ON again.
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