rodz is right. its either the check valve or the retract solenoid for that room. problems with either part can cause the problem. normally, if its the solenoid, the room will come in about three inches, if its the check valve, it will be less. its easy to replace both parts. there is a diagram of the location in the service manual for slide rooms. the harness for the rooms is marked for each solenoid, either extend or retract.
if in doubt, replace both. the check valve is cheap enough. the solenoid will be about 182 dollars new. ask for remanufactured, its cheaper if they have any in stock. send an email to service@hwh.com include name address, phone number, as well as coach info, like vin, year make for warranty on the part.
they will call you back.
