How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Phil Your Own Question
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 8768
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
Type Your HVAC Question Here...
Phil is online now
A new question is answered every 9 seconds

I have a complete heat system and the blinking code says the

Customer Question

I have a complete heat system and the blinking code says the limit switch is open. No hot water
Submitted: 2 years ago.
Category: HVAC
Expert:  Phil replied 2 years ago.


If you can take the following photo's and send them to me using the paper clip icon above, on the right end of the tool bar, I can mark them up with trouble shooting and possibly repair instructions depending on your skill sets.

1. Photo of the various parts of the system taken from about 10 feet away at various angles.

2. Photo of the wiring diagram glued onto the back side of one or more service panels.

those need to be well lit, very well focused and taken from close up, and straight on.

3. The model number of the inside unit, and the unit sitting outside and the approximate age of the system.

4. Tell me the name of the closest city and if system cools or heats the house well or not, and if

hot water production is the only problem.

So far I suspect high head pressure due to dirty heat exchangers or a defective high limit switch.

We can go from there without any time limits.


Customer: replied 2 years ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer: replied 2 years ago.
Phone is(###) ###-####
Customer: replied 2 years ago.
Here are the pics I live in Cape Girardeau misdouri
Customer: replied 2 years ago.
Elect. Schematic
Expert:  Phil replied 2 years ago.


If you can locate the systems wiring diagram(s) that will help a lot.

Meantime I will call you on the telephone.


Expert:  Phil replied 2 years ago.

Ok, thanks, ***** ***** the electrical diagrams.