26
Step
Possible Cause
Check-out procedure
Corrective action
No Heat
5
Riello burner
application
Check for 120 Volts on the
black wire, contact (COM)
on the burner activation
relay.
Yes - Move to next step
No - Back to step # 4 or check for bad
connection
Check if primary control is
on reset
Yes - Press reset button
No - Move to the next step
Check for continuity
between the two wires
yellow and violet on the
burner activation relay
Yes - Move to next step
No - Change the electronic fan control
Check for 120 Volts on the
contact (No) of the burner
activation relay
Yes - Move to next step
No - Change the burner activation relay
Check for 120 volts on the
orange wire coming to the
burner (L)
Yes - Failure on the burner
No - Change the electronic fan control
6
Blower
.
Low speed
Check if the
constant low
speed switch is
ON
Check for 120 Volts at the
''CONT'' terminal on the
electronic fan control
Yes - Move to next step
No - Change the electronic fan control
Check for 120 Volts on both
side of the constant low
speed switch
Yes - Check ''LOW'' speed on the
blower motor
No - Change the switch
(NO) Cooling / Heating
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