Bosch 250sx EC error code - Water Heaters

6ya staff

• 2 Answers

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

Steven Foerst

• 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

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