Home Shopping and COMB reported an impasse.

The rival shopping networks said of their merger talks that “while discussions are continuing with a view toward resolving the outstanding issues, no assurance can be given that the open issues will be resolved.” The companies had announced on Jan. 20 that they had reached an agreement in principle under which Home Shopping would pay $36 worth of its stock for each of COMB’s 18 million common shares in a deal worth about $650 million.