Thermal Care Aquatherm RQE, Operation, Installation, And Maintenance Manual

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15
Troubleshooting
Problem Possible Cause Remedy
Alternating
overheating and
overcooling or
rapid cycling from
heat to cool Poor water flow Check connectors and increase size if necessary. If there are
a large number of hoses and/or they are long, try to shorten
hose runs and use as large of a hose as possible to
minimize water-circuit pressure drop. If quick disconnects
with check valves are used, remove the check valves to
reduce pressure drop through water circuit.
Poor connection or failure of RTD Check connection, replace if necessary
Failure of the microprocessor Replace controller
Unable to heat
properly Cooling valve is stuck in the open position Flush out the cooling valve by adjusting the Set Point up
and down several times to open and close the cooling valve.
If this does not work, stop the unit and turn off the electric
power, shut off the cooling source, and take the valve apart
for cleaning or replacement.
Leaking connection and/or the manual pressure relief valve
is in an open condition Check for leaks and replace any faulty valves
Immersion heater is inoperative Have a qualified electrician check to see if the heater and/or
heater contactor are functioning correctly and replace any
defective components.
Controller failure Replace controller
Failure of RTD Replace RTD
Unable to cool
properly Cooling water supply is not sufficient Check to make sure the cooling water supply is of sufficient
temperature, volume and pressure for the unit.
Drain (cooling water return line) is not sufficient Check the drain (cooling water return line) to ensure there is
no restriction preventing water flow to the drain (cooling
water return line).
Cooling valve is inoperative Check the drain (cooling water return line) and see if you
can feel or hear a change in the flow as the cooling valve
opens and closes. If you cannot hear or feel the flow it is
likely the valve has failed. Replace valve if necessary.
Plugged heat exchanger (only on models with heat
exchanger option) Clean or replace heat exchanger
High backpressure in the cooling water system Reduce backpressure
Heater failure Unit not filled with water Fill unit with water
Faulty heater Replace heater
Plugged heater tube / flow restriction Clear obstruction
Pressure relief
valve leaks The combined pressure of the incoming cooling water
pressure and the unit pump pressure exceeds the pressure
rating of the pressure relief valve Install a pressure-reducing valve on the incoming cooling
water line. Review the start-up procedure for cooling water
pressure requirements at various operating temperatures.
Pressure relief valve stuck in open position Replace valve
Drawings
We have prepared a custom set of drawings for your unit and placed them on top of the unit prior to shipment.
Please refer to these drawings when troubleshooting, servicing, and installing the unit. If you cannot find these
drawings or wish to have additional copies, please contact our Customer Service Department and reference the
serial number of your unit.