Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
Ouch! Kane is less than half that... Maybe time to upgrade!
Sprint V1 : fault with oxygen sensor & calibrate , £130.20
labour only £24 ,
vat : £30.84
Reply to the thread, titled "Calibration / repair" which is posted in Air Sourced Heat Pumps Advice Forum on Plumbers Forums.
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.