TK SL300-no amps display.

[frigoexpres]

I have a TK SL300 with thermoguard uP V.
By pressing the "amps" key, does not show amps, just lines.
What should I check for the display to show the amps?

[clivemtk]

switch on unit and press amps display should show a positive or - negative number in contol box check or replace fuse 11 and fuse 13 if still ---- check micro plug with wires vhn and vhp for connection pushed out check continuity from f11 and f13 to plug

[gravy258]

clean the plugs at the back of the micro with electrical parts cleaner, then apply electric grease to the pins.
this is a easy first step, them try what clivemtk suggests

[frigoexpres]

Thank you for answers.
I replaced the relay board.
Problem solved.