14
5 - Troubleshooting
Air is in the pump.
Prime the pump.
Remove QD off the ma-
chine and solution hose.
Make sure that the three-
prong clip on the inside of
the threaded end is evenly
aligned below the thread
of the QD.
Pump runs but there is no spray.
Possible Causes
Solutions
On a new unit, the check
valve between the pump
and heater may hang up,
causing the flow of water
to be impeded or stop
entirely.
Remove the check valve
temporarily and check to
see if the pump will flow
water out of the pump out-
let hose when the pump is
turned on for a brief instant
in order to verify cause.
The remedy is to install a
new check valve. Observe
the proper orientation (flow
direction) of the check
valve.
Tip: the check valve may
be able to be temporari-
ly returned to service by
un-sticking the check valve
poppet with manipulation
of the poppet ball with a
thin tool, like a straight-
ened paperclip. Replace
the check valve in unit
assembly.
NEVER OPERATE A UNIT
WITHOUT A CHECK
VALVE IN PLACE.
Pump runs for a second then shuts down.
Possible Causes
Solutions
QD is pressure locked.
Relieve pressure from be-
hind the QD by pressing in
the button inside the QD.
Low PSI.
Possible Causes
Solutions
The jet nozzle could be too
large.
Replace the jet with one
that has a smaller opening.
Pump doesn’t stop running.
Possible Causes
Solutions
Leak somewhere in the
line.
Disconnect the solution
hose from the machine.
If this causes the pump
to stop running then the
problem is outside the ma-
chine, either in the solution
hose or tool. If it continues
running on, open the ma-
chine and check for leaks.
Repair the leak. If there are
no leaks, run Mytee’s Sys-
tem Maintainer™ (Part #
3601) through the machine
to clear blockages.
Cracks or vacuum leaks on
inlet side of pump.
Make sure hoses are
secured tightly. If the
inlet side of the pump
is cracked or damaged,
replace the pump.
Seals have been degraded
by chemical.
Install seal repair kit.
Debris blocking inlet filter
or pump head.
Clean filter and/or pump
head.
Pump trips circuit breaker when turned on.
Possible Causes
Solutions
Short in power switch.
Test by swapping vacuum
and pump switch. If prob-
lem resolves, but vacuum
begins tripping breaker, re-
place switch (Part #E515).
Short in electrical harness. Risk of electric shock.
Do this at your own risk.
Remove pump from circuit
by attaching power leads
together. If breaker still
pops when switch is tog-
gled, then there is a short
to the ground in the circuit.
Replace wires as needed.
Short in pump motor.
If switch and harness
check is OK, the short
may be in the pump motor.
Replace pump.
