Fan speed control on PEFY-25VMM-A

[Paul a/c]

Hi guys dose any one know of any thing eles which , controls the fan speed on the mitsubishi PEFy-25VMm-A models apart from main pcb, I've only got 15 mins to swap over pcb in morning before people come in . Fault is there's no change in fan speed what so ever, also unit turns it self off after an hour, going to change pcb from anther unit what I know works and see how that plans out
cheers for any pointers

[install monkey]

http://www.mediafire.com/download/hepa4zpx0xrurux/PEFY-P20-125VMM-E_Technical_%26amp%3B_Service_Manual.pdf
similar manual- should be able to whizz it over in 10 mins- just ensure ur dip switches are set the same

[stufus]

Unit could have the fan speed locked at the controller or a G50 ,Or it might be the wrong model controller , could also have a 1hr off time programed at the controller ,The later usually shows up on the controller display if it's individually controlled.
Takes 5mins to swap board if access is good
Cheers
Stu

[Paul a/c]

Cheers for that got pcb out of other unit already. There is a G50 units are all controlled via a main P C and each office has the control on the P C as well I am hoping it the pcb thanks guys

[install monkey]

some controllers will show 4 fan speed tiangly things but only have 2 speeds- also check static duct pressure dipswitch- duff evap coil sensor , or faulty lev head will keep fan in low speed in heating mode

[Paul a/c]

Il check that , the fault is it seem to be in a high fan speed making to much noise as coming out vents .

[install monkey]

check the grilles arent closed down, as theyll whistle