Service manual

Electric Booster– Installation, Operating and Maintenance Instructions
10
Troubleshooting Section 8
8.1 TROUBLESHOOTING
Problem Possible Cause Solution
Incorrect thermostat setting. Remove booster heater front panel.
Adjust thermostat to correct setting
and check thermometer during rinse
cycle.
If machine cold, run rinse cycle twice
before checking proper reading.
Temperature should reach 180ºF –
185ºF (82ºC –85ºC).
Temperature too low or too
high. (Read rinse thermometer
on dishwasher).
Thermostat fault. Check and replace, if necessary.
Rinse water temperature still
too low during continuous use.
Water supply to booster
heater below 140ºF (60ºC).
Read incoming water temperature by
combination gauge. Incoming
temperature should be 140ºF (60ºC)
(unless booster heater is specifically
designed for lower supply
temperature).
Increase incoming water temperature
to 140ºF (60ºC) at hot water supply
tank.
Pressure setting of pressure
reducing valve too high.
Read pressure on combination gauge
during rinse cycle.
Pressure reducing valve “PRV”
should be adjusted to dishwasher
specifications usually between 20 –
25 p.s.i.
Thermometer on dishwasher
not functioning properly.
Tap thermometer gauge with finger
during rinse cycle. If needle does not
move freely, contact dishwasher
manufacturer.
Booster heater too far from
dishwasher (more than 3 ft.)
Insulate pipe from booster heater to
dishwasher.
Relocate booster heater closer to
dishwasher.
Heating element(s) burned
out, faulty contactor or loose
wires
Turn off electricity to the booster
heater. Check elements, contactor
and wiring for continuity.