Flashing '11' error code
SOURCE: Energysaver 1004FTR
Check for a blockage in the heat exchanger. Spiders love to make nests in these units. Remove the front cover and the two rectangular viewing ports on the front of the heat exchanger. Watch as the unit ignites. There are three burners you need to watch and the first one is in the center and hard to see. If there is flame but it goes out quickly, you have a blockage in the unit. Check the venting to make sure it is clear of debris.
SOURCE: I have a Rinnai 308FTR heater and the first time I
Means failed ignition/no gas.
Check gas supply.
SOURCE: fault 14 on rinnai energysaver 556ftr
Hi.
Error code 14 is Overheating error.
The error can be caused by the high limit sensing overheating and cutting off. In that case the thermal fuse may not blow. The high limit can be reset tripping circuit breaker and allowing the unit to cool down with power off.
If that does not work , then the thermo fuse has blown
In fact tis unit has a thermo fuse. (refer to manual).The thermal fuse can be tested reading continuity. If thermal fuse has blown, then replace the the thermo fuse. If the thermo fuse blows again, then there is a condition causing overheating. 
Here Full service manual.
Unless you are a trained technician call Rinnai support ringing the number in the manual. Some of testing and repair operations described are not suitable for the home user.
Regards.
Ginko.
SOURCE: Have inherited a Rinnai energysaver 1001 FT gas
Found a link to the service manual for starters
http://www.rinnaisales.co.nz/tradesmart/rinnai2/pdfs/service_info/225.pdf
The flue system looks very similar to some current models. I'd go to Rinnai direct and try and get a list of local service agents who can order the bits in. The flues are very tricky to order because there are so many different bits depending on where you need it to run so order carefully.
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