Tekmar 364 problems

4035larry

Hi All,
I just purchased a house in Gustavus, AK that has a boiler system with a Tekmar #364 controller. Now I am from the west coast and know almost nothing about a boiler system! Basically what is happening is the boiler is heating the water up to 170 degrees but the pumps are not coming on to distribute the hot water to the floor heating and hot water storage tank. We ran the "test" mode and all the pumps fired up and worked fine. We even had the original plumbing and electrical installer look at the unit with no results. Any insight or possible solutions would be GREATLY appreciated!

HomerJSmith

Let me get out my crystal ball, now where in the heck did I put it?
You haven't provided enough information to come to any real conclusions. Pics and more information forth coming, I hope.

GGross

I think a couple of pictures of the system, and the 364 wiring may help. It is possible the 364 is not functioning correctly, or even wired wrong

Big Ed_4

That control should be equipped with an outdoor sensor . It will prevent the heating pumps from turning on if the outdoor temperature rises about the set point . 65* is the normal setting...

4035larry

Thanks for the quick response guys! We had the wiring checked first thing against the schematic with the electrician who wired it and everything check out fine. I should have mentioned that when we first opened up the house the system worked (although sporadically) and failed to work at all after a power outage. Big Ed- This is a possibility on the temp sensor- where would I check that at?

Big Ed_4

The outdoor sensor should be mounted on the North-West side of the building . It is a resistor you can check it with a ohm meter and the chart..

STEVEusaPA

Download the manual. It tells you how to check everything with a meter.
If that checks out, then go thru the settings.
Then jump out to simulate a call for heat. The outdoor reset could be over ridden, or the sensor could be put in a cup of ice water if your above the WWSD temp.
You could also use a decade resistance box to simulate any outdoor temperature
You mentioned power outage. Maybe a spike caused some havoc.

JohnNY

If the pumps run in test mode and the display shows no errors, your issue lies in programming.  The manual can be daunting and I agree the likely setting to address is “WWSD”, but if the system has activated this feature it will say so on the standby screen. Let’s use our available tools and post a picture or two of the unit’s display for a start.  

4035larry

Hey guys- Thanks for all the suggestions! Turns out the number 3 pump was bad. Got it replaced and all is good now.