Installation Manual 2013 Riv 2 29
Simple Trouble Shooting Guide - Continued
Compressor fail to start
Each heat pump system will have a time delay on the compressor start operation if the
compressor fails to start in a set number of times in 1 hour then a fault code will appear.
Causes
1. Low oil pressure
2. Crank case heater fault
3. Power failure or a communication error to the compressor
4. High discharge temperature protection
5. High pressure fault
6. Low pressure fault
7. Compressor down to earth
8. Compressor run or start current to high
9. Compressor incorrectly wired (phase protection or phase rotation)
Never try to force a compressor to run as this may cause further faults to occur on the
system.
Power Failure
A power failure may be external to the heat pump system and may just be an error by the
end user or other contractors, don’t assume the power has failed due to to the product
that you have been sent to look at.
Causes
1. Faulty isolator or switch
2. external fuse or M C B tripped or blown this may be caused via a component on the
system being down to earth or exceeded the start or run current ie compressor or
fan motor
3. Internal fuse / M C B tripped or blown.
4. Fault with the electrical connection or cable.
5. Fault with a P C B or contactor / relay
6. Fault with a control panel or time clock
7. Fire alarm interface
8. B M S
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