Chamberlain lists the CH348 wireless keypad as compatible with white Security+ 3.0, yellow Security+ 2.0, purple/brown Security+ and red/orange Security+ openers — the current Chamberlain Group generations, not the older green LEARN-button units. The CHU48 universal wireless keypad covers those same generations plus the green Chamberlain Group branch and specified Genie Intellicode, Linear MegaCode, Stanley, Wayne Dalton, Guardian, Sommer and Ryobi systems. Pick CH348 when the opener is a current-generation Chamberlain, LiftMaster or Craftsman unit; pick CHU48 when you have a green-button opener or a listed non-Chamberlain radio system. Both use a 9-volt battery and both support permanent and temporary PIN workflows. 'Universal' still means 'only the exact systems named in the compatibility table.'
What you are likely to notice
- You are choosing between the CHU48 and CH348 keypad for the same door
- A listing says one keypad is 'universal' and you are not sure that matters for your opener
- Your opener has a green LEARN button and a CH348 compatibility row does not list it
- You want one keypad for a Genie, Linear or other non-Chamberlain opener
- You already bought one keypad and it will not program to the opener
Check these in order
1. Identify the opener brand and LEARN-button generation first
Open the opener's light lens or receiver cover and record the LEARN button color: white, yellow, purple/brown, red/orange or green for the Chamberlain Group family. For a non-Chamberlain opener, record the brand and model so you can match it to an exact radio technology such as Genie Intellicode or Linear MegaCode. This one observation decides the answer; keypad brand and packaging claims do not.
2. Choose CH348 for current-generation Chamberlain Group openers
CH348 is listed for white Security+ 3.0, yellow Security+ 2.0, purple/brown Security+ and red/orange Security+ openers. If your Chamberlain, LiftMaster or Craftsman opener is on one of those branches, CH348 is the simpler match and there is no compatibility benefit to buying the universal model instead.
3. Choose CHU48 for a green-button opener or a listed competitor system
CHU48 adds the older green Chamberlain Group branch that CH348 does not list, plus specified Genie Intellicode, Linear MegaCode, Stanley, Wayne Dalton, Guardian, Sommer and Ryobi systems. Use CHU48 when the opener falls outside the CH348 row — not as a default 'safer' choice, because a broader table is only an advantage if you actually need one of the extra branches.
4. Confirm the exact radio technology before trusting a brand name
A brand appearing somewhere in the CHU48 table is not permission to assume every opener from that brand works. Genie, Linear and the other listed brands each have supported and unsupported radio families. Check the opener model or the active receiver label against the manufacturer's exact compatibility list before buying.
5. Treat an added external receiver as the real target
If a plug-in or wired external receiver was added to an older opener, program the keypad to that receiver's radio path, not to the original motor unit's generation. A green-button opener with a modern add-on receiver may actually need the CH348 branch that matches the receiver, and a newer opener with a legacy receiver can flip the other way.
6. Program the permanent PIN and test before adding a temporary PIN
Both keypads use a 9-volt battery and both offer permanent plus temporary PIN codes. Install a fresh battery, program the permanent PIN with the opener's matching LEARN sequence, and confirm it opens the door reliably with the door in view. Only then create a temporary or guest PIN, so a programming fault is not confused with temporary-code expiry behavior.
Stop DIY troubleshooting when…
- The opener generation or external receiver cannot be identified
- The opener radio family is not named in the keypad's manufacturer compatibility table
- The keypad housing, battery contacts or wiring shows water or physical damage
- The door itself is heavy, crooked, off-track or has damaged spring or cable hardware
Garage door springs, cables and a falling/unbalanced door can store or release dangerous force. Those are door-system problems, not just opener settings.
Manufacturer sources used
These links are the factual baseline for the diagnostic claims above. Model-specific manuals can supersede general guidance.