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Bosch 250sx EC error code - Water Heaters

Posted by Anonymous on

4 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

peterrance19
  • 399 Answers

SOURCE: i AM GETTING AN A2 ERROR CODE

hi ill try to help the fault is in the overheat cutoff fuse its the white overheat wire fuse that wraps around the heat exchanger disconnect the plug connector between the fuse wire and the control unit ! using a multimeter check the resistance through the fuse to see if its bad !if its bad check to find the cause ie .a leakage of flue gasses on the heatexchanger also check the black rubber seals located at the top and bottom of the heat exchanger also inspect the seal around the viewing window on the heat exchanger then call tec support and report leakage areas also for fuse replacement the only number for tec support i can find is 08006423111 i do hope this helps

Posted on Dec 06, 2009

1stBSP
  • 52 Answers

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.

Posted on Apr 11, 2010

  • 50 Answers

SOURCE: i have a bosch aqvastar 250 sx ng error code EC

Q. EC - Ionization failure during operation
A.

  1. Verify gas type (See Fig. 2 in installation manual) corresponds with the type of gas supplied to the heater.
  2. Verify the three yellow wire connections to the set of electrodes (underside of the burner assembly) are secure.
  3. Verify that venting meets specifications per chapter 3.6 of the installation manual. Improper venting may cause premature failure of the flame sensor rod.
  4. Check gas pressure. See Bulletin TWH-G2-03.
  5. Check and adjust CO2 readings. See Bulletin TWH-G2-12.
  6. Gas valve or flame sensor may be damaged. Call Bosch Water Heating with observations and results of previous steps.

Posted on Mar 06, 2011

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1 Answer

BOSCH 250SX TANKLESS WATER HEATER A2 ERROR


http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Jan 08, 2014 | Water Heaters

1 Answer

I have a Bosch 250sx NG I hired a plumber to install. I have 3/4 water and 3/4 gas line to unit. When turned to hot the water is cooking, turned down it is great,,, almost. My water will turn cold for...


Before calling service technician, open following link for Bosch troubleshooting steps.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

If you are not getting error code, then problem could be somewhere in plumbing, as you suspect.
For example cross-over on single-handled faucet, or faulty check valve on re-circulation system, or sediment clog at elbow, or varied water-well pressure. Install in-line pressure tank.
http://waterheatertimer.org/pdf/Bosch_Overcoming_fluctuating_temps.pdf
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Be sure to read manual for yearly maintenance protocol.
Tankless must be maintained, and cannot be exposed to hardness in water greater than 11 grains, and should be de-limed each year. Expect maintenance, service, and potential repairs and parts for tankless to far exceed expected $1-8 monthly savings. All costs are energy.

All gas tankless brands can be repaired by homeowner for $330.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Apr 22, 2011 | Bosch Water Heaters

1 Answer

I have a bosch aqvastar 250 sx ng error code EC keeps appearing


Q. EC - Ionization failure during operation
A.
  1. Verify gas type (See Fig. 2 in installation manual) corresponds with the type of gas supplied to the heater.
  2. Verify the three yellow wire connections to the set of electrodes (underside of the burner assembly) are secure.
  3. Verify that venting meets specifications per chapter 3.6 of the installation manual. Improper venting may cause premature failure of the flame sensor rod.
  4. Check gas pressure. See Bulletin TWH-G2-03.
  5. Check and adjust CO2 readings. See Bulletin TWH-G2-12.
  6. Gas valve or flame sensor may be damaged. Call Bosch Water Heating with observations and results of previous steps.

Mar 06, 2011 | Bosch & Tankless LP Hot Water Heater

2 Answers

Our Bosch 2400E NG tankless water heater is displaying the EC code. I've checked the ionization electrode (rubbed it with a pencil eraser as instructed once before when we had this problem) and I also made...


Had same problem on my five year old water heater (ec error). Didn't figure it was a gas supply problem after five years but double checked to see if the gas bill was paid. It was.

Cleaned the contacts on the two sensors that are clamped to copper pipes inside. Still had error after powering up. Held the error button in for about five seconds, and the blinking EC code went away.

May 21, 2010 | Bosch AquaStar 2400ES-NG

1 Answer

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.

Mar 20, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

Bosch on demand tankless water heater gwh 2400 E LP error code "


BOSH AQ 250 On demand propane water heater ran out of propane, got gas now, but get EC flashing on the display and the unit won't fire? Lost manual, any suggestions. Thanks, Jim

Jan 06, 2010 | Bosch AquaStar 2400ES-NG

2 Answers

I AM GETTING AN A2 ERROR CODE ON MY BOSCH 250SX NG WATER HEATER/ NEED HELP


hi ill try to help the fault is in the overheat cutoff fuse its the white overheat wire fuse that wraps around the heat exchanger disconnect the plug connector between the fuse wire and the control unit ! using a multimeter check the resistance through the fuse to see if its bad !if its bad check to find the cause ie .a leakage of flue gasses on the heatexchanger also check the black rubber seals located at the top and bottom of the heat exchanger also inspect the seal around the viewing window on the heat exchanger then call tec support and report leakage areas also for fuse replacement the only number for tec support i can find is 08006423111 i do hope this helps

Dec 05, 2009 | Bosch AquaStar 250SXO-LP-RE...

2 Answers

BOSCH TWH-G1-25 not lighting


Model????? The 635Es, 250SX and 2400E are same. The 2400ES and 2700ES are World 2 heaters. Any error codes as I can't imagine this problem w/o codes. Flow initiated but you have spark. Is there any ignition? If so flame rod may be bad and not reporting ignition. Igniter sets on some early 2400/2700 have proved to be bad. Water pressure has zero to do with this. If you have an EC or EA code you have gas problems (meter, line size/length or gas valve). Also if 3005 or 3007 Software you can pull the last 5-10 error codes from Controller.
You need to call Bosch and get an RSA out there. This is a gas appliance that if you screw up can destroy your house. FYI any water in the gas valve condemns it. It will not dry out and work correctly. Is the fan running at ignition and/or purge? Any Controller errors require replacement. You have 2 years on parts warranty from installation date so don't screw around trying to DIY. Warranty Labor is not covered.
Flue obstruction? If you used the AQ3 installation Kit you have the wrong termination box to prevent freeze up and/or water penetration You need the Z-Vent drop nosed termination. Look for a fine tan dust in the fan intake (brown plastic) the intake throat or in passageway to the gas valve. Call Bosch unless you're a Gas Tech this is beyond you.

Mar 02, 2009 | Bosch AquaStar 2400ES-NG

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