Brookfield Bath, Model TC-602 - Manual (Page 13)

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5.4 No Heating
• Verify that the unit is pumping properly.
• If the heat light is not lit, check the control temperature set point and bath temperature to verify
that heating is required.
• Verify that the liquid in the bath covers the heater coils.
• Check that the High Limit value has not been exceeded (FLt 1 appears on the display).
5.5 Insufficient Heating
• Verify that the unit is pumping properly.
• Check for proper line voltage.
• Check for excessive external cooling load on unit.
• At higher temperatures, insufficient heating could be due to excessive heat loss from tanks,
hoses, or vapor from the tank.
• Check that the heat demand from connected devices or experiments does not exceed the heating
capabilities of the unit.
• Allow sufficient time for bath temperature to stabilize when changes in heat load or set point are
made.
5.6 No Cooling or Insufficient Cooling
• Check that the Cooling switch is ON.
• If the cooling light is not lit, check the control temperature set point and bath temperature to verify
that cooling is required.
• Check for low or high line voltage.
• Check for blocked airflow through ventilation screens.
• Check ambient air temperature. Refrigeration unit should not be operated above 32°C ambient
temperature as high air temperature may cause the refrigeration compressor to temporarily shut
down.
• Check for excessive heat being transferred to the bath liquid as this may exceed the cooling capacity
of the refrigeration system. Refrigeration should not be used for fluid temperatures above 55°C.
• Check cooling coil supply to be sure sufficient tap water is flowing through the hose (non-
refrigerated units).
5.7 Triac Failure
• (FLt 4) appears on the display, indicating that the heater triac has failed or line supply voltage has
a source of extreme interference from other equipment. Plug the unit into another power source.
If it still displays triac failure, a triac or triac driver needs replacement. If problem persists, contact
supplier.