A UNION investigation is to be launched after a fire service vehicle was alleged to have failed when responding to an incident.
Mid and West Wales Fire and Rescue Service said there was a failure of equipment with the Rural Response Pump only after it had successfully dealt with the fire at a home near Lampeter on Wednesday night.
But the Fire Brigades' Union said initial reports suggested the pump failed, forcing officers to withdraw from the incident, and they would be investigating what happened.
The vehicles were introduced by fire chiefs to provide cover in rural areas of South West Wales, but the FBU said they should have been an addition to the fleet, and claimed they had instead replaced some larger engines.
Their introduction lead to the FBU issuing a safety critical notice against MWWFRS, raising concerns. The FBU issued the second such notice this week, over concerns that backroom staff were being drafted in to cover staffing deficiencies, despite not being compliant with health and safety regulations.
They met with members of the Fire Authority on Thursday night, to raise concerns, and members said they would be seeking a special meeting with the full authority to discuss issues further.
A MWWFRS spokesman said: "The Rural Response Pump was the first to arrive and crews quickly tackled the small fire which was confined to a domestic electrical appliance at the rear of the property.
"After the crews had extinguished the fire, there was a small malfunction with the appliance which was immediately dealt with by replacement of a small part which enabled the RRP to remain operational."