Materials according to their warranttee. Labour for a real long time if it was my error. No waranttee on owner supplied material or machines except if the machine said 208 volts and i connected 600 then I might entertain the claim.
What was our agreement too.
The answer to the customer is 1 year from the date of acceptance and the bills are paid. Nothing like providing a warrantte service when i am in a dispute for payment.
Since it has been a lot of years since i did an install I can say all my warantees have expired.