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8 Malfunctions
8.1 Troubleshooting
8.1.1
Temperature regulators for heating applications
Malfunction
Possible reasons
Seat and plug are worn or leak.
Foreign particles blocking the plug
Sensor installed in the wrong location.
Temperature at the
sensor exceeds the
Sensor installed incorrectly.
set point.
Regulator or K
Control thermostat defective
Mixing valve: port A closed
Diverting valve: port B closed.
Regulator or K
Temperature at the
Sensor installed in the wrong location.
sensor fluctuates.
Sensor installed incorrectly.
Time constant is too large for the control
loop.
Slow control
response
Sensor installed incorrectly.
EB 2173 EN
/C
coefficient too large
VS
V
/C
coefficient too large
VS
V
Recommended action
Î Clean the seat and plug.
Î Contact SAMSON's After-sales Service.
Î Remove foreign particles.
Î Contact SAMSON's After-sales Service.
Î Change the mounting position.
Î Immerse the temperature sensor with its entire
immersion depth in the process medium.
Î Avoid an installation site where idle times or
heat buildup can occur.
Î Check the sizing.
Î Install a suitable valve.
Î Contact SAMSON's After-sales Service.
Î Replace the control thermostat.
Î Check the sizing.
Î Install a suitable valve.
Î Contact SAMSON's After-sales Service.
Î Change the mounting position.
Î Immerse the temperature sensor with its entire
immersion depth in the process medium.
Î Avoid an installation site where idle times or
heat buildup can occur.
Î Fill the thermowell with thermal paste or
remove the thermowell.
Î Use a sensor with smaller time constant (e.g.
vapor pressure thermostat).
Î Immerse the temperature sensor with its entire
immersion depth in the process medium.
Î Avoid an installation site where idle times or
heat buildup can occur.
Malfunctions
8-1
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