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Thanks a lot. I actually fugured it out in the end but thanks again

For sure, lennox these days

Good luck. Try looking at the Rockwool range of products

No. That's too big an increase

I assume you have a ducted heating system. If so, you can add a cooling coil into the duct with a direct expansion (DX) condenser. Daikin make a very good model. You could actually get a heat pump...

Yes, it reverses the refrigerant cycle... Usually, the heat output (kW) is greater than the cooling output

Is the air duct insulated. This sounds like a severe condensation case. Where is the water collecting?

Check this out as soon as possible. Sometimes this smell is leaking refrigerant

Shut it off. There are web sites telling you how to charge a refrigerant system

Mould in dwellings is primarily caused by lack of ventilation. If the system works on a return/exhaust basis then the humidifier won't make any difference with regard to the mould.

Could be a control malfunction or voltage to the fan

They don't appear to match a temperature scale - seems like stages from low to high. Try putting a thermostat in the room and record temperatures when the unit cuts out.

Also possible fan blades are rubbing the casing - fan out of balance

Fit a time clock... or set it on your controller if there is one

First obvious step is to check the set point temperatures. Is the refrigerant charge enough? Are you in the UK? R22 is not readily available here and outlawed from 2015.

Probably! Try using a hair dryer on the board for a while. It may dry some of the components that are still damp... Is the auto ignition function working?

What's the model and make of the units? Manufacturer's Installation Manuals are sometimes available on line and include wiring diagrams.

If the 24V cables are out then there's no control...

If you mean a remote controller, the answer in NO. It will continue to run until you switch off manually unless your unit has automatic cutout features

In a mathematical formula how can I find the 5th root of a number (similar to the SRT(x) function