Hi all

Could anyone advise me on what a low evapotaor to air TD would indicate please ?

I have a system which in normal running has an average 10 degc TD between evaportaor sat temp and air return , but on this paticular system i am getting only 5 degc TD,
I am wondering if a compressor not running at full capacity due to broken valves etc would cause this ?

any help much appreciated

thankyou