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I have a lochinvar hot water boiler that will not start it tries then cuts off

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If it gets through purge and unit begins to ignite, and then goes off it may likely need to have the flame sense rod cleaned.

Posted on May 11, 2010

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Posted on Jan 02, 2017

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I keep getting the word temp o/shoot when i turn on


Means that the boiler has over heated to quickly and the delta T is too high.

POSSIBLE CAUSES
- no water in system
- proper water flow not present
- air in system
- bad sensors

Nov 24, 2013 | Lochinvar Water Heaters

1 Answer

Water to hot for gas boiler boiler gos off


It could be dyslexia, but I think you want to know what may be wrong with your boiler in this case!
This is a VERY old design. The diaphragm is on the water section, this operates a switch to turn ON the pump, and a further device causes the diverter valve to divert boiler water from CH duty to HW duty.
From your description it appears that the boiler is shutting down on internal boiler water temperature (too high), your 'briefly too hot' HW symptom may be caused either by the boiler side of the secondary heat exchanger being blocked/caked in sludge, OR the DHW side of it being scaled. Either way a new or replacement (descaled) secondary heat exchanger MAY inprove things. It's not easy on these old clunk-pots, and EVERY disturbed seal will subsequently leak, so get a good supply of o-rings and fibre seals before you start ("you" being the competant fitter you employ)

Dec 20, 2012 | Water Heaters

1 Answer

Sime super 80.. Heating and hot water at the same time?


going off on a safety possible high temp unit needs service such a nozzle filter if oil or thermocouple if gas

Jun 16, 2017 | Water Heaters

1 Answer

Lochinvar The boiler is purging, ignitor is getting hot, but


This could be something as simple as a gas valve turned off. First check all the gas valves, (one inside the heater, one outside and one at the source.) Also if this is LP gas make sure that you have enough gas. It takes at least 30% in the tank before the heater will fire. In many places their may be an earthquake valve. If this fails it will shut the gas down to the heater. Their are many reasons the heater won't fire and the fellow who told you to change the board probally works for Lochinvar. You might want to have a repairman look at the heater first before you spend that money. Good luck.

Feb 16, 2010 | Lochinvar ENERGYRITE 250K BTU NATURAL GAS...

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