JFD WHE - 3, Operation And Maintenance Manual

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KI-OM-0591 Rev 3 27
Troubleshooting
Contactors buzzing. Dirt, debris or rust on pole pieces of
contactors. Disassemble contactor and sand pole
pieces and clean.
Low frequency on system. Check frequency. If frequency is
below 60 Hz, see if frequency can be
increased.
Faulty contactor. Replace.
Contactors will not close. Open circuit in wiring to holding
coil.
Check wiring and if required replace
broken wire.
Faulty holding coil. Replace.
Faulty contactor. Replace.
System will not start. Input power off. Check input power. Check fault
indicator lights to see if any lights are
on. If any fault lights are on, remedy
fault. Example: low water. Water to
system shut off and float switch will
open thus keeping system off.
Main power switch not turned on. Turn switch on.
Control circuit breaker tripped. Check, reset. If faulty replace.
Faulty main power contactor. Replace.
Pump turns on and off
rapidly. Faulty overload relay. Replace.
Motor shorted. Replace.
Pump will not run for long
periods of time without
overloading. Low voltage to system. Check voltage. If voltage is not a
minimum of 420 V, pump will
overload.
Pump is corroded or jammed inside
and very difficult to turn. Check pump to see if there are any
mechanical problem with it. If there is,
the pump must be repaired. See
Pump Troubleshooting, section 5.1
Heater shuts off with
water less than 70°C
(160°F). Over temperature switch set
incorrectly. Reset over temperature switch to
70°C (160°F).
Contactors will not open. Faulty contactor. Replace.
Shorted wire on holding coil. Check out wiring for short and repair.
System inoperable, no
fault indicator. Burned out fault light. Replace.
Faulty fault replays, R1 and R2. Replace.
Problem Possible Cause Solution