Unit will shut down with the above codes when used. Can be reset but will shut down again after one or two uses.
SOURCE: Heater shuts down with C4-13 code
your not getting enough fresh air to it. where is it located? you need 1 square inch per 1000 btu's. it's having irregular combusion.
SOURCE: Describe your Bosch & Tankless LP Hot
may require gas to to be purge leave to expert
SOURCE: heater will not ignite
The sensor that allows the pilot to ignite is at fault
replace the probe that points at the pilot light which is the sensor
SOURCE: i have a 250SX aquastar bosch tankless hot water
The 250 MUST have the condensate line connected. EC comes from gas supply problems and CO2 levels not being adjusted. LP units require 3/4" smooth gas pipe or 1" corrugated pipe minimum size. The LP regulator needs to be turned up to about 13 inches of water column and with all the gas appliances on, measure no less than 11 inches of water column. The CO2 levels must be measured by a qualified gas technician with a calibrated (with in 6 months) CO2 analyzer.
SOURCE: rheem gas tankless water heater with error code c4 13
problem is inside burner compartment o2 sensor dirty or block..need to have a qualify technician clean it.
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