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Aquastar model 2400e lp error code ec; turned off heater, turned back on, worked for a couple days. This morning-error code ea; turned it off, turned it back on, error code was off but immediately went to error code eo.

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Posted on Jan 02, 2017

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SOURCE: I have a Bosch AquaStar 2400ES-NG, Error Code EA

There are three electrodes (connected next to each other by a single piece of metal) that run up into the heat exchanger. They are situated behind the black plastic air intake in the lower half of the unit. Pull out the electrodes and clean them off with steel wool or fine sand paper. Also take the opportunity to blow the dust out of the inside of the unit and clean out the air intake.

Posted on Jun 15, 2009

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SOURCE: Bosch Aquastar 2400E LP Does Not Heat Water

Sounds like the water flow sensor and servo, may just need cleaning, get it checked out by a Bosch agent

Posted on Jan 17, 2010

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Can you change the bosch 2400e lp over to n gas


See the distributor ,they should be able to supply the required regulator.
I have an earlier model Bosch tankless water heater. my instruction says mine can.
I would assume that yours should be also.
Good Luck.

Mar 12, 2011 | Bosch AquaStar 2400ES-NG

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

1 Answer

Bosch Aquastar 2400E LP Does Not Heat Water


Sounds like the water flow sensor and servo, may just need cleaning, get it checked out by a Bosch agent

Nov 10, 2009 | Bosch AquaStar 2400ES-NG

3 Answers

Bosch 2400E EC code


it sounds more like the gas valve, you can taje the numbers off of it call or e-mail the compant and buy a new one,,, the thermal coupling keeps the piliot lit but i don't get it RECONDITIONED, I have been doing plumbing for 34 years now and to get a water heater thats reconditioned it would probobly be cheaper to buy a new water heater with this kind of problem good luck

Apr 17, 2009 | Bosch AquaStar 2400ES-NG

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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