service manual.vp - eTundra
service manual.vp - eTundra
service manual.vp - eTundra
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Diagnostics – Air Cooled<br />
Problem Likely Cause Probable Solution<br />
Shut down on<br />
maximum freeze time<br />
Pump hose disconnected<br />
Compressor not operating<br />
Low refrigerant charge<br />
Hot gas valve leaks through<br />
during freeze<br />
Thermostatic expansion valve<br />
bulb loose<br />
Thermostatic expansion valve<br />
producing very low or very high<br />
superheat<br />
Compressor inefficient<br />
Check hose<br />
Check compressor contactor,<br />
check controller using test<br />
mode<br />
Check compressor start<br />
components, check PTCR<br />
resistance and temperature<br />
Check compressor voltage<br />
Check compressor windings<br />
Add some refrigerant and<br />
restart unit. If cycle time<br />
improves, look for leak.<br />
Check hot gas valve for hot<br />
outlet during freeze<br />
Check bulb<br />
Check evaporator superheat,<br />
change TXV if incorrect<br />
Check compressor amp draw,<br />
if low and all else is correct,<br />
change compressor<br />
September 2006 Page 43
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