Landline call blockers are essential tools for protecting UK households from nuisance and scam calls. However, like any home device, they may occasionally stop working or show signs of disruption. This blog explains the best troubleshooting tips if your landline call blocker stops working and how to keep your protection active.
Why Do Landline Call Blockers Stop Working And What Basic Checks Should You Try First?
Many issues with landline call blockers stem from simple connection or installation problems. Before assuming the device is faulty, checking the basics often resolves the issue instantly.
Start with these initial checks:
- Loose or incorrect wiring: Ensure the call blocker is connected between the phone socket and the handset, as required by most models.
- Power connection issues: If your device uses a power adapter, confirm it is plugged in securely and the outlet works.
- Changed phone service type: A recent switch from PSTN to Digital Voice or broadband-based calling may require installation changes.
- Accidental resets: Power cuts or unplugging can reset some call blockers to factory settings.
- Caller ID not enabled: Without caller ID, the device cannot identify or block unwanted numbers.
Ofcom’s 2025 Phone Equipment Performance Review reported that many user issues were related to wiring or caller ID settings rather than hardware faults.
Summary: Most issues arise from wiring, power, or caller ID settings, making basic checks the best starting point.
What Technical Troubleshooting Steps Can Help Restore Your Landline Call Blocker?
If basic steps don’t resolve the issue, more detailed troubleshooting can help restore normal operation.
Useful actions include:
- Restart the device: Disconnect and reconnect the call blocker to refresh internal functions.
- Factory reset the unit: Some devices offer a reset button that restores default settings.
- Check caller ID by testing another phone: If the phone you're using cannot display caller ID, the call blocker won't function correctly.
- Reinstall based on the correct service: PSTN, Digital Voice, and broadband-based systems may require different installation steps.
- Test with another handset: This rules out issues caused by faulty phones.
- Update your blocklist: If spam calls are slipping through, your list may be full or outdated.
These steps address most software or setup-related issues.
Summary: Restarting, resetting, and checking caller ID functionality are the most effective technical troubleshooting steps.
When Should You Seek Professional Support For Your Call Blocker?
While most issues can be fixed at home, certain problems require professional assistance. Knowing when to seek support ensures your home remains fully protected against nuisance and scam calls.
Contact customer support if:
- Your device won’t power on despite working sockets
- Buttons or screens stop responding
- Blocked numbers continue ringing repeatedly
- Caller ID fails across all phones in the home
- A recent broadband or Digital Voice migration affects functionality
If your device is under warranty, you may be eligible for a replacement. Many manufacturers also provide troubleshooting guidance via website, email, or live chat.
Age UK highlights the importance of keeping call-blocking tools fully operational for older adults who rely on them for protection.
Summary: Seek professional support when hardware failure is suspected or when issues persist after troubleshooting.
Conclusion
Troubleshooting landline call blockers is usually straightforward, and most issues can be fixed through simple checks, resets, or reinstallations. Ensuring your device works properly keeps your household protected from unwanted and fraudulent calls. For reliable year-round safety, explore our range of CPR Call Blockers.
FAQ
Q: Why is my landline call blocker not blocking calls?
A: It may be due to wiring issues, caller ID problems, or incorrect installation.
Q: How do I fix a call blocker that freezes or stops responding?
A: Restart the device or perform a factory reset.
Q: Do I need caller ID for my call blocker to work?
A: Yes. Caller ID must be enabled for the device to recognise and block numbers.
Q: When should I contact customer support?
A: When issues persist after troubleshooting or if the device shows signs of hardware failure.
