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Adjustments on the right CO2, because my water heater wont fire properly

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Get someone qualified to adjust it may need new nozzle

Posted on Dec 12, 2012

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Is 218 ppm peak a high reading on my CO meter? it is mounted near my gas hot water meter.


I was told there should be no reading at all on the CO2 testers. If you have any reading call the fire department or 911 and they will check it for nothing. You could die with that kind of reading.

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My co2 dector sounds alarm near hot water heater


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Turn of the hot water valve and turn on a hot water tap in the house. If You have water flow, then you have a problem with a faucet (usually a shower valve). Go to the shower valve and see if you hear water running. If so that is likely the problem. Otherwise there is not enough gas to fire the unit that far and it will fail out. Check the manual most people install these units wrong. If you install it to code then you did it right. If you install it to the manufacturer's specs, you installed it to code and it is right. Then the only adjustment is with a Calibrated CO2 analyzer (instructions in the manual).

Apr 02, 2010 | Bosch AquaStar 250SXO-LP-RE...

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I have a 250SX aquastar Bosch tankless hot water heater . It keeps going out on EC code; whats wrong? Also I've been running the unit for about a 9 months without hooking up the condensate dain line.


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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250sx quit working. Gas o.k. water flow good, throws ea code after 3 start attempts. 1. where is the ionization electrode, and is the fan supposed to come on before ignition? Fan comes on afterea code....


The gas pressure must be increased at the regulator from 9 inches of water column to about 12.5-13 inches of water column. The CO2 levels need to be adjusted for each installation. The air intake MUST come from outside the same wall as the exhaust. I have never seen any manufactures tankless unit installed properly. Plumbers do not read the manual.

Jan 24, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

The elbow is broken and the air from the hot water tank is leaked


Any exhaust air coming from the gas water heater is potentionally life threating. I would get it fixed. Do you have a CO2 meter close by the water heater? If it is leaking air back into the house that has CO2, after a certain amount the alarm will go off. If you dont have one get one. A must have with gas appliances.

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Bosch SX 250 tankless water heater will attempt to fire 3 times then EA code. I have spark through viewing window. Read troubleshooting manual. Says Check ionization electrode. There is no part in the...


This is also known as a flame rectification sensor. It basically is what the computer board uses to detect if the pilot flame is lit. When it makes an attempt to fire is there any evidence of flame ignition? This error does not mean that the sensor is bad for sure. The error could be caused because the water heater is only making three attempts to fire and then shutting down. These water heaters are very complex and have many sensors,valves, ect that are all controlled by a computer board. Some of the basic things to check for are... Make sure that you have plenty of gas pressure. These units have a built-in pressure switch and will have issues if they are starved of gas. Most of these tankless water heaters are up to 400,000 btus and a half inch gas line or undersized connector won't work well. You can also check and make sure there is no pipe dope are debris stuck in the screen inside the gas line where it enters unit. Inspect the pilot assembly for debris or obstructions and try to blow out with compressed air. Also look for any loose electrical connectors on the board or to the sensors...one may have come loose.

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Smelling co2 around tank, replaced ventilation but still smell co2? need to see if there is a special way to install ventilation (model # whirlpool fg1f4040s3nov) gas water heater


You may be smelling other products of combustion but CO2 is a color-less/smell-less gas. A water heater should be vented thru 4" vent pipe to either a chimney or a wye which joins it with another appliance and a larger(size must be calculated) connector which connects to the chimney. There can be no reductions in size as you travel toward the chimney, and all pipe must slope at least 1/4"/foot up toward the chimney. Single wall vent pipe can be used unless it is less than 6" from anything flammable in which case type "B" vent may be used with a clearance of down to 1". If all this is correct your chimney may be over-sized or obstructed. Proper venting can be very complicated and technical and takes up most of most installation manuals for any fossil fuel appliance.

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