The Bureau of Meteorology says it hopes the Namoi Radar is repaired soon.
The radar, located on Black Jack Mountain, monitors weather within 200 kilometres of Gunnedah, reaching from Moree to Mudgee and Coonamble to Armidale, and covering Tamworth and the Liverpool Plains.
A spare part was installed last weekend, but it failed shortly after installation.
Acting Regional Director, Stephen Lellyett, says the power supply within the actual unit is experiencing problems.
He says the new part will cost around $30,000 and the Bureau is hopeful the Radar will be back online within a week.
"We've located a spare, it's been packed up in Melbourne for transport to site and then once the technicians arrive at site there'll be some diagnostic and testing to be done," he said.
"So, we're hoping we'll have it up and running within the week and that, of course, assumes what we believe the problem to be is actually the problem."
The Bureau of Meterology says there are several other options for checking weather conditions while the Namoi Radar is out of action.
Stephen Lellyett says there's quite a few options still available for people in the New England North West keen to keep an eye on their weather.
"Within 100km of the Radar we've got three automatic weather stations, and 10 alerting rainfall stations, and within 150km of the Radar we've got six automatic weather stations and 25 alerting stations," he said.
"They're all available on the Bureau website and there's also the Moree Radar to the north-west."
© ABC 2013
14:04 EST A low pressure system making its way across across southeastern Australia has been bringing rain and storms with it, and some of the best rain in over a year over the interior.