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Trouble shooting
Doc No: OMMB00301 Revision: 1 – Nov 2019
Section 8
Trouble shooting
In the event that the cooling system does not operate close to the desired
temperature, the following guide may help to identify or locate the
problem.
8.1 System temperature too cold
1. Insufficient heat rejected to coolant to maintain temperature.
2. Wrong nominal element temperature selected.
3. Thermostatic valve greatly oversized or cooling capacity of
system much greater than required.
4. Thermostatic valve installed backwards, thus sending water to
cooler at low temperatures.
5. Worn or leaking O-rings allowing leakage to cooler.
6. Excessive pressure drops across valve.
7. Foreign matter preventing closure of elements.
8. Bimetallic type thermometers will indicate low if calibrated in oil.
8.2 System temperature too hot
1. Cooling capacity of system inadequate.
2. Thermostatic valve too small for flow rate causing high pressure
drops and possible cavitation problems.
3. Valve installed backwards, reducing flow to cooler as temperature
increases.
4. Bypass will not close due to worn or pitted seats, sliding valve,
seals etc.
5. Elements may have seen sufficient over-temperature to prevent
full movement, thus preventing full cooling.
6. Solids building up on element sliding valve preventing correct
operation.
7. Foreign matter stuck between sliding valve and seat.
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