Tankless water heater does not turn on. Reads error h2. How do I fix it?
SOURCE: A2 error on Bosch tankless water heater
SOURCE: BOSCH AQUASTAR 2400ES NATURAL GAS TANKLESS HOT WATER HEATER
Q.
FA - Gas leakage error, gas valve circuit not closing properly
A.
Q.
EA - No flame ionization detected with water flow
A.
Q.
C1 - Fan rotation too low on startup
A.
SOURCE: Bosch Pro tankless water heater overheating
The vent pipe you use is the correct size for the heater.Longer runs require bigger pipe.I also would check to see if the water is getting to hot.
SOURCE: no hot water, pilot light lights but no burner ignition
Thermo coupler may be defective. it controls the main gas valve by closing main if pilot is out. make sure thermo coupler bulb is positioned over and near tip of pilot flame, but not in the flame. Thermo couplers are inexpensive and easy to change out.
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.
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