Any HTP Pros Out There?
I'm having a problem with an HTP Elite, model EL-220N that I can't figure out. I'm getting a "Water High Temp E00" lockout even though the boiler is cold. I've replaced the Combo Supply/High Temp. 7450P-192 sensor and still get the same high temp. lockout. I've also replaced the motherboard and don't know where else to turn to in order to figure this out.
Maybe there's another ECO sensor that I'm unaware of?
Two btu per sq ft for degree difference for a slab
Comments
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What error does the thermostat on the outside of the hx trigger? Did you check the resistance of the sensor at both the sensor and the controller?
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This system works off the outdoor sensor - no thermostats. (Is that what you mean?)
I did not check the resistance.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
No. At least on a UFT there is a snap disc thermostat on the outside of the hx presumably to detect the hx itself overheating from lack of water or circulation or maybe also rollout from a leaking gasket.
I say to check the resistance to see if there is a problem with the wiring or if they gave you a bad sensor or the wrong sensor or if the original sensor is bad. I think it is just a thermistor.
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Are there any external safety controls that could be wired in to the switch portion of that combo? I can't remember if there are any molex connectors along the way on that - I would ohm the wire harnesses.
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Stupid question Alan . Are you moving water , boiler circ going or getting ready to ?
You didn't get what you didn't pay for and it will never be what you thought it would .
Langans Plumbing & Heating LLC
732-751-1560
Serving most of New Jersey, Eastern Pa .
Consultation, Design & Installation anywhere
Rich McGrath 732-581-38330 -
The wiring from the outlet sensor to the molex connect at the circuit board is uninterrupted; no other devices in series.
There's no thermostat on the outside of the HX. And yes, Rich: water is moving.
Just to repeat, the burner does not come on. The water does not have a chance to get hot. It's a false positive.
I haven't returned since I posted this and I'll return later this week with a new wiring harness.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
is there a manual reset high limit wired into the 928 control, terminal X7-9 X7-19.
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Yes, It's the red reset button on the control.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
(not an htp expert but kind of a control expert in other realms)
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Don't ask me why; I never ohmed out the sensor or the sensor wires where they plug into the circuit board. But yesterday, I replaced the sensor and the low voltage wiring harness as I felt that should take care of any problem with sensing and transmitting resistance readings. But no, I still got the same error message: "Water High Temp F00 Lockout".
It's unusual for me to replace a boiler because I can't get past a hard lockout, but this is one of them.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
what did htp say? there aren't too many possibilities here
bad new board
bad sensor
bad connections
some other condition also produces this error
my bet is on 4
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make sure the back of the control board isn't shorting to something somehow too.
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I've had 5 boilers die this week. Two Munchkins, a Laars and a Viessmann………and this HTP. I consider it dead because I'm tired of dealing with it and there's a crush of work on me. Would love to get into the minutiae, but there are other fish to fry.
It's a 12 year old boiler; heats BB and an indirect for a co-housing building, so it's been doing a lot of work. Maybe a bit early to have to replace it, but I'd like to get a more user friendly boiler in there. Probably a Lochinvar as it's one of the few floor-mounted boilers out there.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
looking at the manual. that code isn't in there but it is an ntc thermistor, the resistance reduces with temp increase so if it is unplugged altogether it should think the water is very cold. if it is still thinks it is too hot then it is a problem with the control or a problem with the other control wiring being shorted or connected to voltage in such a way that the circuit that reads the resistance of the sensor looks like the sensor is close to shorted. but if they need heat soon then replacement would be faster.
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As you can see from one of the photos, it's a 4-wire molex plug to the sensor with one of the wires going to a separate power board. When you unplug the molex plug, you get a "sensor not connected" error message which makes me think the there's also tracing voltage somehow going through the sensor that detects when the sensor is missing.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
This is not a model that I’m familiar with.
If you post the wiring diagram, I’ll be happy to look at it.
Bob Boan
You can choose to do what you want, but you cannot choose the consequences.0 -
I think he already has condemned it. no idea what the deal is with the 4 wires, just shows a chart with resistances for the sensors. maybe it has a lwco probe too or something. i looked at the manual but didn't look at the schematic.
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Yes, it's condemned. And I can't find a wiring diagram on short notice.
@Timco Tim White used to work at HTP. Maybe he has some insight if he's still there?
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
I’m wondering if the upper sensor in the second pic is an additional temp sensor?
Bob Boan
You can choose to do what you want, but you cannot choose the consequences.0 -
I believe that’s the pressure switch.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0
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