RhoZeta
New Member
Having an odd problem that I can not figure out and searches for similar issues turn up nothing so I am posting to the forum in hopes that somebody has seen this before.
Equipment and setup;
Trane 5 Ton Heat Pump unit in a 2 story home, using a Honeywell 3 zone controller, (Only uses 2 zones) for upstairs and downstairs. Have two Trane (Honeywell) T-Stats, one upstairs one downstairs with only difference being upstairs T-Stat can also control Emer Heat (Heat strips).
Problem;
About 1.5 years ago, came downstairs one morning to the A/C blowing and T-Stat said it was 56F, tried shutting it off at T-Stat and no response. pulled T-Stat off the wall and it shut down. Found the 3 AA batteries leaking acid, upon opening unit found that the acid had damaged the control board. Entirely my fault for not changing the batteries. ( I no longer put batteries in them, system has a power wire, really no need)
Went to the HD and found a new Honeywell WIFI T-Stat, I think it is a T-5. Installed unit, worked fine except that the A/C would run in A/C or Heat. Did some Trouble Shooting and changed the O wire over to a B system with T-Stat programming changes as well and after that the heat pump would run with heat or A/C called. Spent a frustrating few days trying to figure it out,called the worthless Honeywell help line and they had no clue how to help.
In TS I can touch the bare wires together and it will call for heat pump and A/C respectively, the upstairs T-Stat works as it should as well.
Tried another Honeywell T-Stat that is identical to the Trane T-Stat except it is Honeywell branded and same results. In frustration I ordered an identical Trane T-Stat as the damaged one and the problem persist.
Also in TS I moved the T-Stat and damper from Zone 2 to the unused zone 3, thinking there was possibly an issue with the zone controller and the problem persist.
In summary;
I can individually call for A/C and heat using the wires at the thermostat and it works fine so I am assuming wiring from T-Stat to zone controller is good.
I switched the T-Stat and damper wiring from zone 2 to the unused zone 3 and problem is same.
The system runs as it should from T-Stat upstairs, set it to heat, heat pump comes on, set it to cool and A/C comes on.
Zone controller is not indicating any faults and it displays properly with each call, red LED lit up for heat, yellow LED lit up for A/C with condensing unit responding accordingly.
T-Stats used;
Honeywell T-5 Lyric WIFI, Performed setup per instructions including equipment selection (1 C 1 HP)
Honeywell RTHD8500, identical unit to the Trane that was in use before problem.
Trane TCONT8000, IS the identical part number as the original unit.
I am game for thoughts and suggestions, thank you.
Equipment and setup;
Trane 5 Ton Heat Pump unit in a 2 story home, using a Honeywell 3 zone controller, (Only uses 2 zones) for upstairs and downstairs. Have two Trane (Honeywell) T-Stats, one upstairs one downstairs with only difference being upstairs T-Stat can also control Emer Heat (Heat strips).
Problem;
About 1.5 years ago, came downstairs one morning to the A/C blowing and T-Stat said it was 56F, tried shutting it off at T-Stat and no response. pulled T-Stat off the wall and it shut down. Found the 3 AA batteries leaking acid, upon opening unit found that the acid had damaged the control board. Entirely my fault for not changing the batteries. ( I no longer put batteries in them, system has a power wire, really no need)
Went to the HD and found a new Honeywell WIFI T-Stat, I think it is a T-5. Installed unit, worked fine except that the A/C would run in A/C or Heat. Did some Trouble Shooting and changed the O wire over to a B system with T-Stat programming changes as well and after that the heat pump would run with heat or A/C called. Spent a frustrating few days trying to figure it out,called the worthless Honeywell help line and they had no clue how to help.
In TS I can touch the bare wires together and it will call for heat pump and A/C respectively, the upstairs T-Stat works as it should as well.
Tried another Honeywell T-Stat that is identical to the Trane T-Stat except it is Honeywell branded and same results. In frustration I ordered an identical Trane T-Stat as the damaged one and the problem persist.
Also in TS I moved the T-Stat and damper from Zone 2 to the unused zone 3, thinking there was possibly an issue with the zone controller and the problem persist.
In summary;
I can individually call for A/C and heat using the wires at the thermostat and it works fine so I am assuming wiring from T-Stat to zone controller is good.
I switched the T-Stat and damper wiring from zone 2 to the unused zone 3 and problem is same.
The system runs as it should from T-Stat upstairs, set it to heat, heat pump comes on, set it to cool and A/C comes on.
Zone controller is not indicating any faults and it displays properly with each call, red LED lit up for heat, yellow LED lit up for A/C with condensing unit responding accordingly.
T-Stats used;
Honeywell T-5 Lyric WIFI, Performed setup per instructions including equipment selection (1 C 1 HP)
Honeywell RTHD8500, identical unit to the Trane that was in use before problem.
Trane TCONT8000, IS the identical part number as the original unit.
I am game for thoughts and suggestions, thank you.
