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Posted: 12/15/2016 11:59:52 PM EST
I have tried redoing the wiring and thermostat.

It seems to have a mind of its own on when it wants to work.
That is why a fan is mounted.



Link Posted: 12/16/2016 12:18:49 AM EST
Huh? What? Maybe a few small details like what exactly is happening may help 
Link Posted: 12/16/2016 12:21:21 AM EST
See Bulletin UH-IM-2.
Link Posted: 12/16/2016 12:22:08 AM EST
[Last Edit: 12/16/2016 12:24:33 AM EST by Kashtin]
Are you saying the fan does or does not come on at times? Google Klixon fan switch.


Here, I did it for you.
Link Posted: 12/16/2016 12:23:25 AM EST
Time for a new heater?
Link Posted: 12/16/2016 12:25:17 AM EST
I see a house fire in your future! Heater next to that foam

And that's just the tip of your problems!
Link Posted: 12/16/2016 12:48:16 AM EST
Fan should come on automatically when the water is at temperature and the stat is calling for heat.

So I would guess

1. Fan is bad

2. Circuit that controls fan is bad

3. Water is not circulating properly and not getting hot enough to trigger fan

Work down the list
Link Posted: 12/16/2016 12:58:09 AM EST
I see that you don't have electric hooked to the heater fan. That might help, just saying...
Link Posted: 12/16/2016 1:11:39 AM EST
Link Posted: 12/16/2016 1:15:28 AM EST
What's a Help-Heater?
Link Posted: 12/16/2016 4:07:22 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By ZW17:
I see a 24v zone valve in your water piping and a 120/240v line voltage thermostat.

I don't see a 24 transformer.

What opens and closes that zone valve on that water piping?
View Quote


I would imagine the thermostat circuit is 24v
Link Posted: 12/16/2016 4:09:06 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By ZW17:
I see a 24v zone valve in your water piping and a 120/240v line voltage thermostat.

I don't see a 24 transformer.

What opens and closes that zone valve on that water piping?
View Quote


I would imagine the thermostat circuit is 24v

Just a guess but that line voltage stat may control a different heater
Link Posted: 12/16/2016 4:12:43 AM EST
J. F. C.!

You, sir, deserve Order of the Kludge with HVAC cluster.
Link Posted: 12/16/2016 10:07:30 AM EST
[Last Edit: 12/16/2016 10:08:50 AM EST by beemerman]
I'll take a stab at it from only looking at the picture. Assuming 24v control circuit and ,you are getting hot water to the fan coil unit, does the zone valve open when thermostat calls? Are you getting power to the zone valve?
When the zone valve is powered does it open and the coil gets hot? If not, there should be a manual override lever that you can open the valve with.
There is a end switch in that valve that should make and, powers the fan . Is power getting through the end switch to the fan? I would remount the fan assembly before proceeding.
Link Posted: 12/16/2016 7:09:53 PM EST
Bump for op report.
Link Posted: 12/16/2016 7:21:59 PM EST
In my experience the zone valve opens with thermostat command, the fan has another temp sensor usually on the hot water supply pipe that turns the fan on/off - since it works sometimes I'd say:
1) fan switch setpoint is set to high
2) fan switch is malfunctioning
3) control wiring loose or corroded (you should just redo all the wiring anyway)
4) fan circuit wiring is loose or corroded
Link Posted: 12/16/2016 7:29:14 PM EST
[Last Edit: 12/16/2016 7:35:39 PM EST by basicone]
I'm a little confused, is that a forced air garage heater with sweated copper for the gas supply?
View Quote


Edit to add: yeah, that seems to be the case.

I would start with looking to see if the fan control is actually controlling the fan, on, off, on ,off.
Then check to make sure the the fan control element is located to get heated by the heat exchanger.

As long as the unit is firing up with the thermostat, you just need to ID the fan operation.
Link Posted: 12/16/2016 8:41:06 PM EST
Sorry for being late.
My 2yr old daughter takes up a lot of my time.

The fan turns on only when it wants. Will have to trace its wires so i can see what it gets.
It can go for weeks/months without turning on.
Than only turn on a few times.

Have replaced the thermostat and zone valve.
Pipes are getting hot glycol from boiler.

Will go check what voltage is coming from the z-valve as i have forgotten.
Link Posted: 12/17/2016 7:12:55 AM EST
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