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CAUSE C
Thermostats may not be functioning correctly or may be improperly set.
SOLUTION - Inspect thermostats for proper operation and
correct settings. If setting is below the maximum, reset to
190ºF(88ºC) If defective and not functioning, replace.
CAUSE D
Contactors are not performing.
SOLUTION
- Inspect contactors for proper operation by
visual observation. Assuming no fuses are blown and
power is coming to the booster, inspect the coil and replace
if defective.
CAUSE E
ECO (high temperature limit switch) may be defective.
SOLUTION - Check for proper operation and replace if
defective.
CAUSE F
The fuse is blown.
SOLUTION - Replace fuse. If fuse continues to blow, either a
contactor coil is defective, or the booster control transformer
is defective. If booster has more than one contactor,
disconnect wires so only one contactor at a time is energized.
The defective one can then be isolated and replaced.
On all boosters with low water cut-off, the following trouble shooting
procedures apply.
CAUSE G
Relay does not pull in after booster is filled with water and air bled out.
SOLUTION
1. Check for voltage at line terminals 1 and 2 using volt-meter
or test light. If there is no voltage, refer to CAUSE F.
2. Open circuit between ground and the probe. Check for
broken wire or poor contact at connections. To test, run
temporary wires from probe terminal #3. If relay pulls in,
the wire is broken and should be replaced.
3. Check or open relay coils. With line voltage applied at 1
and 2, connect a jumper wire between 6 and 7. Relay
should pull in when the jumper is connected and fall out
when the jumper is removed. Failure to do so indicates
one of the coils is open and the relay should be replaced.
4. Fouled probe. If solution 2 discloses no broken wire or poor
connection and relay still does not pull in, probe tip may be
insulated by lime buildup. If relay operates when a jumper
wire is connected between terminals 3 and ground, the
probe is fouled. Remove probe and clean the electrode.
TEMPERATURE
REACHES
(77ºC - 79ºC).
THIS CONDITION AS DIFFERENTIATED
FROM CONDITION II INDICATES THE BOOSTER HEATER
IS FUNCTIONING, BUT MAY NOT BE REACHING PROPER
TEMPERATURE (180ºF, 82ºC).
CAUSE A
Booster should be close to the dishwasher, (5 feet or less). If the
booster is more than 5 feet away, the heat loss through the pipes is the
most likely reason the dishwasher thermometer reads only 170ºF
ONLY
170-175ºF
4
(77ºC).
Make certain the thermostats are set to their maximum
calibration. They are pre-set at the factory to 190ºF (88ºC) to
compensate for heat loss but they may have been turned down to 180ºF
(82ºC) by someone overlooking heat loss through the pipes.
SOLUTION - The booster should be moved to within 5 feet
of the dishwasher if possible, and the pipes should be
insulated.
CAUSE B
Thermostats may not be functioning correctly.
To help determine this cause, check rinse
temperature in the dishwasher. Since the dishwasher
temperature gauge could become defective, it is
preferable to rely on a temperature sensitive tape or
a thermometer rather than the gauge for checking
this cause.
SOLUTION - If maximum reading is below 180ºF, (82ºC)
first turn the pointers all the way up on all thermostats. If
the reading is still below 180ºF (82ºC), minor adjustments
can be made on the thermostats. If recalibration does not
help, the thermostat is defective and should be replaced.
BOOSTER HEATER REPEATEDLY BLOWS FUSES OR TRIPS
CIRCUIT BREAKERS.
Fuses or circuit breakers should not be loaded to
more than 80% of their rating.
CAUSE A
Fuses are undersized-too small to carry the load.
SOLUTION - Check "Fuse and Disconnect Switch Sizes"
table for recommended sizes. Replace undersized fuses
with correct one.
CAUSE B
Short circuit in internal heater wiring.
SOLUTION - By visual inspection check for: loose
connections, grounded heating elements, frayed insulation
and foreign matter touching wiring terminals.
WHEN THE DISHWASHER AND THE BOOSTER HAVE BEEN
IDLE FOR SEVERAL HOURS, RELIEF VALVE OPENS OR
ECO TRIPS.
CAUSE A
A cause of overheating and resulting relief is excessive primary water
temperature. Primary water temperature should not exceed 160ºF (71ºC).
SOLUTION - Check to be sure primary water heater is
functioning properly. Primary water heater thermostats
may be set too high, causing nuisance tripping. Adjust
primary heater thermostats to 140-150ºF (60ºC - 66ºC).
NOTE:
NOTE:
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