Hatco IMPERIAL "S" Installation & Operating Manual page 34

TROUBLESHOOTING
WARNING
To avoid any injury or damage, the booster
heater must only be serviced by qualified
personnel.
SYMPTOM
Water at dishmachine is not
at the proper temperature.
Heating elements burn out.
Relief valve dribbles.
Relief valve opens.
Form No. EBOOSTERM-0406
PROBABLE CAUSE
Gauge(s) not working
properly.
Thermostat set too low.
Booster heater has more than
(5) linear feet (1524 mm) of
water pipe to the dishwasher,
causing the water to cool off
inside the pipe.
Tank inadvertently
drained leaving elements
in a dry condition.
Lime buildup in tank causing
elements to split and burn out.
No pressure reducing valve
installed or incorrect valve
installed causing pressure
build-up inside booster tank.
Bypass in pressure reducing
valve may be blocked.
Check valve or anti-siphon
valve installed in the feed line.
Unit is overheating.
Contactor may be sticking in
closed position not allowing
unit to cycle off.
32
WARNING
To avoid any injury or damage to the booster
heater turn the power OFF at the disconnect
switch/circuit breaker and allow to cool before
performing any maintenance.
CORRECTIVE ACTION
Check temperature of water with
a thermometer to be certain gauges
are working correctly. If not, replace
gauge(s).
Adjust or recalibrate (page 27). If
thermostat will not recalibrate properly,
replace it.
If located farther than (5) linear feet
(1524 mm), pipes should be wrapped in
insulation, and/or a recirculating system
installed.
Make sure tank is full of water
at all times. Check low water cut-off
system for proper operation.
Clean or delime tanks periodically. A water
softener or blended phosphate treatment
system may be required.
A pressure reducing valve with high
pressure bypass must be installed in the
incoming water line to allow water to
expand back into the feed line.
Clean bypass or replace with new valve
with built in bypass.
Remove check valve or anti-siphon valve
to allow for water expansion or install a
back pressure relief valve on the incoming
water line, Hatco part number
03.02.039.00.
Thermostat may be set too high
or is sticking. Recalibrate (page 27)
or replace the thermostat.
Replace contactor(s).