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Topic: Waeco CAB 40 - do I have a problem?
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28/7/2022 at 11:18am
Location: London Outfit: Lunar Cosmos 524
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Whilst every multi power source absorption fridge I've come across warns against running on more than one power source at the same time, I've never seen an explanation of the consequences if you do so! That would be vital info in fault finding, so for what it's worth, the following is a large dose of speculation, albeit with some engineering knowledge behind it!
As the 240v operation is thermostatically controlled, I would expect once the fridge chilled down the thermostat would trip out (unless set to MAX, where it may possibly bypass the thermostat!), and stay tripped out as the fridge would be continuously cooling on gas power (no thermostat on gas, only a high/low flame setting), so damage potential may be limited as effectively then only running on one power source.
The refrigerant is Ammonia/Water mix which is quite stable until heated to temperatures likely to be far in excess of those achievable by the combined heat sources. The combined heat sources may cause boiling, and an excessive rise in pressure, which potentially may be too much for the 'plumbing' to stand and a leak may occur, you should get a smell of ammonia with any leakage of refrigerant.
I suspect you may have nothing worse than a vapour lock, which does happen anyway on occasions with absorption fridges. Easy to cure, disconnect all power sources, invert the fridge and leave for a few hours, then stand the correct way up, leave for at least half an hour for the refrigerant to settle, then power up and see if working. If it doesn't work properly, invert again and leave for longer.
If that doesn't fix it, I'm at a loss, there is so little to fail on these types of fridge beyond the actual heating sources and associated controls, there are no moving or serviceable parts in the actual cooling circuit. Any fault finding after that would require investigating the heat sources for functionality.
Good luck.
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