Noisy Daikin in Heating Mode.

[Dave Bristol]

Hello has anyone encountered a problem with a Daikin heat pump split a/c unit that appears to work happily in cooling mode, but when in Heat mode it's ineffective and the compressor sounds like a bag of spanners falling down the stairs.
Its not short of Gas nor is it the 4 way valve, Daikin Tech suggest a new compressor and exp. valve but this seems a bit excessive.

Any hints cheers.

[sedgy]

hi dave
is the indoor fan running full speed ? if not the systems psig could be getting very high, = sedgy

[Dave Bristol]

Cheers Sedgy,
fan speed fine, it shows signs of low refrigerant as very poor Refrigeration Effect although in this case it aint Heating. When I check the indoor unit coil temp this is very low and the heat is lost very quickly in the coil.
Dave.

[R. skiffington]

Need to know system pressures really, then we can work out if its a high or low pressure problem. If a compressor runs ok in cooling then why wouldn't it in heating? The actual operating pressures at the compressor are very similar in heating or cooling.