20 Most Recent Philips CD4450 1-Line Cordless Expansion Handset Questions & Answers

if you have had it a while chances r the batterys have had it even though they show full, try a new set, or even try standard batterys briefly while fone is not in charging mode to see if they work during a call.

The default PIN is '0000', 4 zeros. https://www.google.com/search?q=philips+cd535+forgot+pin+code

Philips CD535 User Manual - ManualsLib

https://www.manualslib.com > ... > CD535 Advanced Settings Reset Reset to default settings Press , scroll MENU SELECT Enter the Master PIN when prompted and press If your PIN number is the default 0000

Could be line cord connection at base or other wiring issue. Do you have a different phone(s) at same location that work? If you have a known good phone, the simpler the better, unplug all other tele devices at your location and verify the know good phone works?

You need to dry it out completely. A few centrifugal swings around your shoulder might remove much of the water. Then try one of these drying methods: Place it on a register or AC vent for a day or so might be the best way to get it dry. Afterwards, (if trying to operate it didn't short out a component,) it might work again.

With what kind of batteries you've renewed? Are they rechargeable?

Sorry you will need to pay for that info.