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The units were replaced by the manufacturer, the old units should have been sent back to the manufacturer but the wholesaler lost them. Units are linked by wire. They are radio controlled. regards phil   

Both units were totally replaced, when the new one didn't fix the problem I got another set of batteries and that didn't work. The company has a support line the electrician spoke with them numerous times. The only answer they came up with was insects we vacuumed the units out.   I am at the...

Seven years ago we had our home rewired, this included a mains powered smoke alarm linked to a heat alarm both units optical types. A year ago the alarm went off without cause, it was difficult to say which unit the alarm started with. Our electrician said the batteries needed changing, which...