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I have a service required signal on my lochnivar knight

Customer Question
Hi I'm Gad. I...

Hi I'm Gad. I have a service required signal on my lochnivar knight boiler

Contractor's Assistant: Thanks. Can you give me any more details about your issue?

It says set point met but actually no hot water going out

Submitted: 2 years ago.Category: HVAC
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Answered in 19 minutes by:
2/15/2016
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,621
Experience: 40+ yrs. experience as a licensed oil & gas technician.
Verified

What's the model number of your boiler? What do you mean "no water is going out"? do you mean it's not circulating?

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Customer reply replied 2 years ago
KB 081-286
Customer reply replied 2 years ago
The water is circulating but cold.
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Is boiler cold?

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Customer reply replied 2 years ago
Set point met right after ignition
Customer reply 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.
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Ok sounds like a bad board or a bad sensor. Give me a few to pull the specs for your boiler. A phone call is an additional charge.

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Customer reply replied 2 years ago
Ok
Customer reply replied 2 years ago
How do I check the sensor? I see the board easily
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Do you have an ohm meter?

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Customer reply replied 2 years ago
At home. I'm at office
HVAC Technician: Rick, HVAC Supervisor replied 2 years ago

Sensors are thermistors. System sensor is connected to terminals 21 & 22. Inlet sensor is S2, operating sensor is S1a, limit sensor is S1b. The readings are all different and there too much info to relay here. Here are the service manual
http://www.lochinvar.com/_linefiles/KBII-SER%20Rev%20J.pdf

thermistor ratings on page 35

and the install manual

http://www.lochinvar.com/_linefiles/KBII-I-O%20Rev%20R_100161470_2000013387.pdf

sensor connection points shown on page 80

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