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How to light the Bosch TF250 pilot light
I believe this is a hydro-sparker pilot ignition then burner on when T-Couple/Flame Sensor acknowledges pilot lit.
W/O the signal feedback the Gas Valve will not open and light burner.
This is a Technician Service Job as you have insufficient knowledge to DIY this potentially dangerous LP/NG Control Valve/Sparker Assembly
I assume that lack of knowledge by your lack of a Manual for the Unit
You cannot force ignition on a hydro-sparker manually.
on Sep 12, 2014
Error code e2
E2 is a cold water inlet temp sensor. Has your unit experienced any freezing conditions? If it senses below 36 degrees or above 90 degrees it will show this error.
If its normal temp, and you still get this error...check your sensor. Its an 8(kohm) sensor. Make sure its not open. If it reads ok and your temp is not an issue, then you probably have a bad control board
on May 06, 2014
Testing triac resistance
Triac devices are not restive. They are like back to back SCRs. Once gated they will not turn off until the power crosses zero. It will do that 50 or 60 times a second then needed to be re-gated.
on May 03, 2014
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