Are u using well water or hooked up to city line if well water --may be to cold for unit if water is below a certain temp unit usually goes into error or shuts down if un heated space where water heater is u may have to warm [ insulate ,heat tape etc]the incoming water usually water that around 40 degrees causes problems
I need more information, What is the incoming water temp. Do your have a water softner, What do the error code mean. example: low water pressure, scale build up, ignition failure, The codes should be available to you from Bosch. I'm a Rinnai tankless dealer and highly experience in repair, However I'm not familiar with their codes.
Yes, we do have well water. Although the unit is in a heated laundry room, the water pipe comes in through the cellar and directly up to the unit - probably only 36" total of "heated" pipe area). Thank you - I'll try heat tape. (My husband bought this unit - and I have refrained from saying anything derrogatory... you might have saved our marriage :) !)
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