The voltage will be 0 volts if there is no voltage fault, and between 4.8 and
5 volts when there is a voltage fault.
The voltage will be 0 volts when the remote switch is off, and between 4.8
and 5 volts when the switch is on.
The voltage will be 0 volts when the reset button is pressed, and between
4.8 and 5 volts when the reset button is not engaged.
The voltage will be 0 volts when the thermostat or domestic water system
calls for heat and between 4.8 and 5 volts when heat is not called for.
Blown fuses for the burner, pump, or cabin fans will show a voltage of
between 4.8 and 5 volts. Good fuses will show 0 volts.
10.21 Reduced Output
The heater may run without faulting, but at a reduced output. If
this is noticed, it could be caused by the following:
High altitude
Dirty nozzle
Defective regulator
Too small a nozzle
Poor water circulation
Ash deposit in combustion chamber
10.22 Smokey, Smelly Exhaust
The heater may run without faulting, but you may experience
signs of soot, exhaust smoke and/or a pungent smell. This is
usually caused by the wrong fuel to air mixture. This can be
affected by the following:
Low voltage
High altitude
Dirty compressor air filter
Reduced compressor air output
Restricted combustion air flow (fresh air intake hose / exhaust
system / combustion chamber)
Low combustion fan output (defective motor / wrong rotation /
dirty fan blade)
Dirty fuel nozzle, partially clogged grooves in nozzle distributor
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