Anxious patients are being kept waiting for hours for advice from an NHS hotline.
The NHS 111 phoneline replaced the NHS Direct service in 2013 for patients to get medical help and advice when they have an urgent need which is not an emergency.
Guidelines say worried callers who cannot be dealt with immediately who need clinical advice should be rung back within ten minutes 100% of the time.
But figures for calls to 111 from Huddersfield households show the target was missed every month in 2014/15.
Call backs are happening within ten minutes for roughly three out of ten callers.
A spokesperson said 90% of patients were contacted within two hours.
Figures show the service is receiving at least 130 calls every day from Huddersfield numbers.
Yorkshire Ambulance Service NHS Trust (YAS), which operates the 111 service for the whole county, said 80% of the 1.4m calls it received last year were resolved by the call handlers referring patients on to other services, such as GP out-of-hours or pharmacy, or through providing self-care advice.
A joint statement from YAS and Greater Huddersfield Clinical Commissioning Group, said: “Regional arrangements for clinical call-backs are in place and YAS staff clinically assess all calls waiting for a call-back in order to prioritise those who need the most urgent help.
“Patients are prioritised according to their clinical need and local performance indicators have been agreed with YAS which demonstrate that more than 90% of patients received a call-back within two hours.
“NHS Greater Huddersfield CCG works collaboratively with other commissioners and YAS to ensure the delivery of safe, effective and accessible NHS 111 services which meet the needs of patients.
“NHS 111 staff are dedicated to providing a high quality service and they fully understand the important role that they play in helping callers to access the most appropriate services for their needs.”