4-20
YES
Check
interconnecting wire
between switch and
heater elements..
NO
YES
NO
Replace the switch.
Is there
continuity across
pump/heater switch
when in ON
position?
YES
Reset the circuit
breaker and check
for clogged suction
line or quick
disconnect.
Is the
circuit breaker
open?
Connect P17
(Heater power)
NO
Is P17
connected?
YES
NONO
Is PAN HEAT
light ON?
Turn off the heaters and
check the resistance if the
heating element. If the
resistance is significantly
reater or less than 72 ohms,
replace heater elements.
Filter unit is
working properly.
YES
Are the filter
heaters working?
Check all hose connections
and the hose itself for leaks.
Correct any leaks or the hose
if damaged.
YES
Clean out the filter lines. Check the
current load on the filter motor. If it is
high replace the defective pump.
NO
YES
D
Are a lot of air
bubbles coming out of
the oil discharge
line?
NO
Is pump running
slow, taking 4 to 5
minutes to fill the
tank?
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