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Problem B: residual current device trips
Probable causes
Correction
Excessive moisture in junction box
Dry out and check seal; replace if
necessary. Perform an insulation
resistance test.
Earth fault at:
Locate and rectify the fault and reset or
• connection
replace rcd.
• damaged heating cable
Leakage current too high:
Correct problem and re-design.
power cable or heating cable too long
Contactor bouncing
Replace with higher quality contactor
Voltage spikes in power supply network
Reset rcd. If condition persists, use
clean power supply.
Defective rcd
Replace
Problem C: Ice/snow not melting
Probable causes
Correction
Loss of supply current due to over-current Follow procedures outlined in A and B
or residual current device operating.
above.
Loss of supply cable continuity
Locate and rectify fault.
Incorrect setting or operation of
Repair system controls or set system
system controls
controls correctly
Incorrect contactor sizing or damaged
Rectify
contactor
Problem D: Ice/snow begin to melt, but system turns off too soon
Probable causes
Correction
Incorrect setting or operation of system
Repair system control unit or set system
controls. controls
correctly.
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